Yup, that's what I do pretty much. But, I put them together myself.
But to be honest, around here, they have these things called 'computer expos' where you can buy things at below factory direct prices, so they're a STEAL! Like, 30-70% off on some items! It's nuts! And, if there's a nice enough guy, he'll help you put it together to save time! (Unless you don't know how to, in which case they'll show you or do it for you)