I don't actually have any experience with that particular model, the benQ GW2250. That monitor is actually a "VA" type monitor and tries to make a compromise between IPS and TN monitors, so it's panel type is somewhere in the middle in terms of overall quality. However, I know that BenQ is a good brand. I also wouldn't worry so much about the response times, unless you have super sensitive eyes and play lots of first-person shooters (i.e. CS:GO).
If you really want to know what different monitors look like, I always advise to go check them out in person - go to your nearest Best Buy, Fry's, or even Sears to see what each monitor looks like. You don't need to ask someone there for help (they usually just want to sell you one or two specific brands), just see what looks good to you at a price you can afford.
Things to look for are whether the monitor is IPS or TN, glossy vs non-glossy screen, advertised response times (1ms up to 6ms), refresh rates (60Hz to 144Hz), how well its built, etc.
Nice brands include HP, Dell (these i've only seen online though), BenQ, Asus.
I know Viewsonic used to make excellent monitors (I simply don't know now).
Check out a couple reviews on that monitor:
http://www.trustedreviews.com/benq-gw2250_Monitor_review
http://www.expertreviews.co.uk/monitors/1293850/benq-gw2250hm
Its a great steal if you can get it for $100. Otherwise, I'd look elsewhere. If you can, I'd wait until the Black Friday/Cyber Monday deals.