I will be building my first gaming rig shortly I plan on getting two 6950s overclocking them and using crossfire. I want to maximize my gaming experience but I am not sure what route I should go in terms of monitors. I am leaning towards LED but what is the best option.
Generally speaking, 8ms is not bad for gaming. Yes, the higher the response time, the more chances of seeing ghosting effects. Some would argue that up to 14ms response time is fine. Not sure of that since I don't have experience with that response time.
I play games on a 6ms response time monitor, while I might see a tiny bit of ghosting in some rare instances overall it is good for gaming. The difference between 6ms and 8ms is not that much.
The basic strength of VA panel monitors is the high static contrast ratio which allows for better details especially in dark scenes. I believe VA panels can have up to about 4000:1 static contrast ratio, but I think up to 3000:1 is more common.
There's no reason to tell people to avoid 16:10. As a general rule, most companies higher-end monitors are 16:10 anyway. If you wan't to connect a console to your monitor, then you don't need 16:10, but it won't hurt (you'll just get black bars). If you want to run PC games on your monitor, there's no serious downside. Sure, not all games natively support 16:10, but not all games natively support 16:9, 4:3, or 5:4 either. Effectively zero games support the aspect ratios produced by using multiple monitors, that alone is no reason to discredit using them. You can always force a game to a given resolution/aspect ratio, even if it doesn't "officially" support it. That said, there's nothing wrong with 16:9 either. Choose whatever aspect ratio you prefer. Some want more vertical space, others value horizontal space more.
As jaguar said, 8ms is not bad at all for gaming. I used to play a lot of UT on a laptop screen with a 16ms quoted response time, and never noticed ghosting at all. The asus looks to be a good option, as it's somewhat cheap and doesn't use a TN panel.
A few other general options are 120Hz TN panel monitors, those can display a 120Hz image rather than the standard 60Hz. It's best to find one and see for yourself if you notice the difference. If you don't go fora 120Hz monitor, you could find a VA panel (like the asus) or an IPS panel monitor also within your price range. Here are just a few.
There are obviously a lot of options out there. It would be easier if you specified a few things, like do you prefer 16:9 or 16:10, do you want 120Hz or not, and are you more concerned with picture quality or monitor size?
For $450ish you could get three cheap 23'' TN panel monitors if you wanted to (dual 6950s should be able to handle that), or you could get a single 23.6'' 120Hz panel for ~$350, spend around $300 for a 23'' IPS/VA panel monitor, or spend ~$375 for a 27'' TN panel monitor. It's kind of up to your preferences.