Sorry I've been gone... been working 13 plus hours a day.... Any mobo that will run a 333 fsb AMD will work with a AMD of either a 200 / 266 / 333 model. The size of CPU cache doesn't determine the compatibility.
Barton is just an AMD XP and is pin compatible other XPs. It should even work in mobos that don't support a 333 fsb, but it would clock down in speed.
I don't want to turn this into a heavy "brand name" discussion, so even though I know Asus mobos are 100% compatible, I would say that you should look at various manufacturers that make a compatible mobo, pick the features you like in the price range you can afford, then search the Web for reviews on that mobo to see if it is any good or not.
Visit actual hardware sites like
www.tomshardware.com and the like. Read their reviews on that mobo. See if it's fast, reliable, stable. Learn the pros and cons.
Then pick another brand or two, and see how they compare. You'd might be surprised at what your budget will allow and the features you can get. And even a mobo that is 10 - 15% faster than another equally equipped mobo.
HTH
TwoRails