Having worked in medium format for around 15 yrs I'd always yearned to move into large format. About a year ago my wish came true when I got myself a Sinar 5x4. I was really excited at the thought of discovering everything I'd read about the leap in image quality etc. Now, many hundreds of sheets of film later I'm still undecided about the improvements in sharpness AND tone etc (up to an image size of about 16x20 that is)
Comparing my best prints from a 6x7 neg against my best ones from 5x4, I'm struggling to see any difference. The biggest handicap with large format that I encounter is not being able to react quick enough in situations of rapidly changing light, and I mean light thats literally changing by the second ! I know for sure that I've missed some really great images which wouldn't have happened had I being using rollfilm. Then there's the issues with portability, cost of film, and, something I'm really struggling with lately - even development. I do appreciate the advantages of being able to process normal, plus and minus development times separately though. As for camera movements, I must admit to not being very competent in this area and find that I can often get by without. (the 65mm lens I use doesn't really allow this anyway)
All this reminds me of the saying - 'be careful what you wish for' and I've often thought about selling to invest more in my med format (RB67) system.
However, theres something about the medatitive approach to using this camera that keeps me fascinated with it, and, I guess I'm still learning ! All the stress that this format gives me just makes me even more determined to master it !! Another thing which I'm really impressed with is the look of a contact print and I think if I ever did sell, it would be to move up to a 12 x10 or something and do away with projection alltogether.
Regarding enlargers you might want to look into those that have a drop down base board in order to get bigger prints. Expensive though, I guess.
You could also consider wall mounting the enlarger and constructing a table with drop down shelves or something.
Dont know if this answers any of your questions but just thought sharing some of my own adventures might help.
Bill