Do you exactly have a set budget for the entire PC with its peripherals?
Or are you just trying to go for more value / bang for buck?
That pc provided in your post with that Mid-range graphics card should be able to handle
most source engine games/ MMORPGs at high, but definitely wont have a chance at higher
up games such as Crysis.. MAXING out games with full Anti-Aliasing probably wont happen either.
I guess what matters is what games are you exactly going to be playing...
PS: Building your own pc would definitely be more beneficial if your looking for more performance
