You should try to be a little bit more specific....
is there a specific GAME you are wanting to play?
How concerned are you with the graphic detail level while playing the game?
Are you going to want to multi-task with it also, or just strictly gaming rig?
What is your budget for said computer?
i saw thinkbox and i have never heard of it and i want to know if it is good
for my computer not just gaming, and i don't need amazing graphics but i don't want to have too low of a graphic card so i can't play surtain
games
and no i don't have a spicific game
I disagree about Dell. their PC's are almost always Pentium 4-based, which are not that great for gaming.
the best option IMO is a completely customised rig, which will be higher in performance and lower in price than any Dell or other retail PC