I have a 3+ year old AMD 1700+. I can 5 table Party with PokerTracker and GameTime+ running and there is ZERO lag. I also paid $125 for a newer vid card recently and it can play all the new games at high res.

So, what I'm saying here is you DON'T need a high end box to do what you're asking.

If you have a local computer shop that has a web page, post the link and I can help you to pick the components.