Hi: I thought I'd ad my 2 cents since I went thru what you're going thru about 25 years ago. Some of the things I say are what I'd do if I had it to do all over again....
First, my biggest recommendation is, if you want to do LF, DON'T GO 4X5. Instead, go 5x7 or 8x10 directly. I started in 4x5 and when I went up to 8x10 I found it so easy to use and quality so much higher that I wished I hadn't spent all that time in 4x5. Yes, you can backpack 8x10 - I do it still including a heave Ries wooden tripod. I've climbed all over 600 foot sand dunes with this gear. Personally, I'd start out in 5x7 which I'm beginning to think is the perfect format. Here are a few reasons why:
1) 35sq inches vs 20 in 4x5!
2) Contact prints in 5x7 are actually viewable whereas a 4x5 contact is too tiny to really view let alone frame and see from 15' away.
3) The physical size of a 5x7 isn't that much more than 4x5. In fact, K.B. Canham's 4x5 IS a 5x7 but with a reducing back. You could buy his 5x7 and later get a 4x5 back for it. These are showing up in the used marketplace more and more now. I just bought a near-mint one for $800 less than list - and I got it from a great guy on eBay.
On
www.mpex.com you can see they sell a Tachihara 5x7 for $1299 (in fact the Tachihara 8x10 is also $1299! )
4) You can use this format and make contact prints only and avoid the entire hassle of enlargers and all the associated gear. If you go 8x10, your darkroom could be a lightbulb hung from the ceiling, a contact printing framd and some trays. Edward Weston did pretty well for himself this way. If you insist on enlarging, there are 5x7 and 8x10 enlargers out there (the Zone VI from Calumet does 5x7 and 8x10). You can make stunning 11x14 prints from a 5x7 negative.
5)Like the 4x5, you can put the 5x7 on a tripod, put it over your shoulder and walk around and take pictures. Just as simple to use but you end up with a negative almost twice as big!
There are only a few basic reasons to go to LF:
1) Each picture is it's own negative and can be individually processed.
2) Bigger negatives = higher quality prints. In fact they offer the ultimate in quality, the contact print.
3) Camera movements that allow you to have more control over a)composition and b)depth of field via the Scheimflug (sp?) principle.
4x5, 5x7, 8x10 all offer these advantages. It's just a tradeoff between negative size, equipment investment and 'luggability'. I think 5x7 is a good trade off in these areas. I found in time that 4x5 is just too small of a format - contacts were too small and I didn't like to enlarge much above 8x10.
A word about movements. In spite of what has been written, ALL the camera movents are important, and I do mostly landscape b&w work. In virtually every picture, I am controlling depth of field with swings and tilts. I often have multiple planes of focus in a scene such as foreground receeding into background so I tilt forward a little to increase dof. Then, I have have another plane like a fence running from my left away into the distance on the right, so I swing the lens to the left. Then I can use rise\fall and shifts to tune the composition. As for rear movements, I use them to control some image perspective - if there is a rock in the foreground that I think is too big, I tilt the rear standard forward and the rock will decrease in size becaue the groundglass is now intersecting the image closer to the lens. Don't buy a view camera with front rise\fall, front swing and front tilt and shift. It should also have rear swing and tilt. Shift would be nice but isn't necessary if there is shift on the front. Some have rear rise\fall but this would drive up the price a lot and isn't necessary. Doing some of these compositional movements from the rear are more convenient if the bellows are extended way out and you have to stretch our arms way out there to use the front movements.
You'll also have to consider base vs axis tilts. I started out with base tilts and really loved axis tilts when I chnged cameras. The problem with base tilts is that when you tilt forward the image goes drastically out of focus. So, you have to have your eye on the groundglass, one hand on the tilt and the other on the focusing knob. As you tilt forward you rack the focus knob to keep the image in focus. With your 3rd hand, you keep the darkcloth from blowing in front of your face<g>. It can get to be a jumble. With axis tilts, when you tilt forward the image may go slightly out of focus, but not much. I would not rule a camera out if it didn't have axis tilts for my first camera. Now, I would not buy anything else.
So, do you want to buy 4x5 and all the enlargiing gear or just go right to 5x7 or 8x10 and contact print for a while until\if you decide you'd like to enlarge them?
(BTW, I have an 8x10 enlarger and you haven't seen anything until you see an 8x10 negative enlarged!).
Good luck.
-Mike