Like John said, make sure they will provide the coverage you need. One of my friends uses a Caltar II-E on a Crown Graphic 4x5. We printed a bunch of his black and white in my darkroom and I never even thought about his lens while we were working on his images. Didn't notice any sharpenss or contrast problems. His 4x5 chromes looked pretty awesome too, now that I think about it. I hope that my Caltar II-N is sharper and contrastier, but you'd have to compare them side-by-side to notice any difference. Might just be a good excuse for a photo trip in a few weeks.

If price is an issue don't be afraid of these lenses. They will outperform old lenses, and come with the added benefits of a new shutter and a warranty. Think of it this way, after all these months of admiring Doug's images, I had forgotten he bought a budget lens until you posted this question.

I know you can't tell much from a web photo, but this 392k image may help put your mind at ease.