1. Either shoot 1/4 as much as you do with 4x5, or spend 4x more money. Or something in between the two.
2. Don't limit yourself to contact prints. While they are beautiful, you have to see enlargements from 8x10 film to believe them. If you stay with 8x10, definitely get an enlarger for it. $30,000+ 10x10 enlarger setups can now be had for a few thousand or less. And as a bonus, it will also allow you to print enlarged contact sheets from your roll film.
3. You can generally stop down a bit more without suffering the effects of diffraction, in order to regain some of that lost D of F (if you want it).
4. If you like long lenses, know that it is very tough to use them with 8x10. You need lots of bellows to use a 600mm lens (at the shorter end of long lenses for the format), even if it is focused at infinity. I love long lenses on 4x5. I use a 360mm and sometimes a 540mm. But the equivalent focal lengths are not feasible for me on the larger formats with the setup that I currently have. That will require a lot more investment on my part.
5. Off topic (sorry), but you also owe it to yourself to make at least one high quality drum scan of a frame, just to see what kind of crazy quality you can get over a small format digital SLR, while sharing all the benefits of digital adjusting and printing.
6. Make sure to have a heavy duty tripod. What good are 80 sq-in of negative if the image suffers from camera shake?
I had an 8x10 for a while, but I sold it. I have decided that 5x7 is the best large format for me. I like the aspect ratio better, for one. And it offers a definite quality advantage over 4x5, but at only 2x it's the cost (and half the cost of shooting 8x10). The problem with 5x7 format is if you shoot color. 8x10 has the definite advantage. Though you can slice down 8x10 film to 5x7 size.