If you need good gaming performance, your stuck with the 20ms or 16ms 17" TFT monitors (if you can't afford the new Dell 20" TFT 16ms). Most gamers suffer from ghosting on TFT monitors, except for the new 16ms or 20ms. And remember the vp171b uses the AU Optronic panel, i.e 262k native colors, others must be mixed = slower.
Most people claims the 20ms Huyndai panel which we find in for example Hercules 920Pro is better than the AU Optronic panel. But both (920Pro / vp171b) are very nice monitors, if you have the possibility I would go looking at them IRL. I don't know the prices in US, but $407 sounds very cheap to me. How much will the 920Pro cost? I'm probably going to purchase the 920Pro, but then it's almost $100 cheaper than vp171. And has a nicer look imo 🙂
Good luck with your TFT purchase 🙂