You might consider a scenario, where the machine is hooked both to a monitor, and a big screen TV, setup on a desk where you want in the corner of the living room, such that you can play games, browse the web, etc, on the monitor, but be able to use it as a media PC at the same time, (play movies blue rays, etc), by simply dragging play windows over to the television and expanding them.
Personally, I'm a huge fan of dual monitor setups for productivity. I run linux, and use it to run a lot of simulation and productivity related apps (both windows apps under wine and linux apps). Some games may allow for a practical dual monitor situation where you could be playing on one monitor and using the other to browse (probably MMORPG's would have a way to play that would allow this to work well enough, which might be nice for crafting and other tedious operations while researching toon building). On the other hand, the type of games that are more "in your face" will typically either be best played on 1 monitor or 3.
Tiger vs Newegg: Can't comment tiger specifically. I've always done business with the egg and always seemed to be able to use combo specials and promo codes or discounted items and time their deals to get as good a price (or close enough) from them to compete with the other major online sources of hardware. I personally really only suggest builds from newegg because I can navigate their site and find good deals faster than through other retailers (I'm just used to their interface, so have a routine).
Give us a sort of summery of the current position you find yourself in budget wise, and in terms of how you want to approach the monitor situation, and I'm sure we can get things moving here again.
Edited by mdocod - 9/4/12 at 11:18pm