Last year I put together a low power HTPC running a Asus AMD Zacate E35M1-M PRO Motherboard with integrated Readeon 6310 HD graphics controller, 4 gigs of RAM., a Antec EarthWatts EA-380D Green, and an ssd. It's currently running windows 8 consumer preview and does alright as it goes. It's a little annoyingly slow at times but works well for what I use it for most of the time.
Now I haven't done any PC gaming in a decade or so but now that Diablo 3 and Torchlight 2 are coming out soon I was thinking of at least giving it a shot and maybe catching up on some other games I've wanted to play like Starcraft 2. I don't need to play with the very best graphics as I've been fine with console level graphics for a while, but I wouldn't mind the game looking decent and I certainly want it to be playable in a non-frustrating manner.
So I was wondering should I:
1. Play it on my HTPC as it is
2. Buy a decent low profile graphics card to add to my box and maybe a new power supply if needed. If so what should I get without breaking the bank?
3. Give up on that and build or buy a gaming PC instead.
What would you do in this situation?