It uses both onboard graphics and a separate gpu add in card. Boonality's build and the one I linked are very similar, except the option for the 4 output vid card on mine. The processor I chose is a bit faster and has the potential to become a quad, but for online poker usually no more than two threads will be at work. Also I didn't have a DVD drive in my build, but the one you picked is fine. With the 4850x2 gpu it will come to about 625, if you choose a cheaper video card and go hybrid it will depend on the card you get. If you go that route be sure to read up on the hybrid thing, because you want to make sure the card and MB will both work together in hybrid mode, not all cards will work with all MBs that way.
He might be better off getting a LARGE 37" or greater 1080p hd lcd tv, and running multiple tables on one monitor. They would still be large enough to very legible on a screen that size at that resolution you could have 10+ tables going without a problem.
yeah, I mentioned the 37" because they are under $500 at Wal Mart...and I've seen 32" for about $350, but I'm not sure if they were 720p or 1080p. But one large monitor will give you more screen real estate than 4 small monitors.
The 4850x2 was a rec simply because the OP needed 4 monitor support from a single gpu, and the 4850x2 is the only one with native 4 monitor support. I agree he could go with a crossfire capable Mb and get two lower end cards, or go with a larger monitor and accomplish the same thing.