whew, I bet the picture on that viewsonic is amazing. The difference between 17" and 19" wouldn't really hurt you as far as room space goes.
I know basically nothing about LCD monitors besides they are flat
My friend got himself one not too long ago, was a 19" and has a pretty good picture....don't know what the response time is but I could ask him see which one he got. However I believe he got lucky and newegg had it on sale for like $229 and it's normal price was above $350