hey aeo,
Go with a 17", if at all possible. look for one with a high contrast ratio(>200:1). Don't get one if you're planning on running any "hardcore" video games(Doom, Quake 3, etc.) or for viewing movies. LCD screens just don't have the refresh rate necessary. You will notice severe ghosting/blurring, especially during high-action sequences. (nothing beats a CRT for this reason alone)
For everyday users, buy the cheapest you can find. Brand doesn't matter as far as quality is concerned since monitor manufacturers are all using the same lcd vendors. Use your own best judgement. Afterall, your eyes may be better then the salesmans. shop, shop, shop around, deals on them can be found. Be wary buying from online vendors(read any fine print/warranty info).
I work in the consumer electronics repair industry, just my 2 cents.
P.S. You can touch an lcd screen as much as you want. It takes a good amount of force to break one. ($$$ fix)
good luck.