Thanks for the quick replies.
Even though I can build my own, and have in the past, I've been considering buying the prebuilt ones because I can get an extended warranty, which may not seem like a big deal, but considering if I were to buy and build myself I'd probably end up with some cheap parts and run in to problems down the road.
Another thing is that with the PC I linked up top, the PSU should be able to support a better GPU somewhere down the road, which is something I'm willing to upgrade in a year or two, the RAM should be sufficient at 8GB, even though I'd like a Mobo that could reach 16GB, 8 should be fine for the lifespan of the overall tower.
Probably the weakest thing on the tower would be the CPU, the FX-4100 is rated as a low-budget Bulldozer model that is excellent for the price, and reports to easily overclock by 1 full Ghz (bringing it to 4.6Ghz) using the BIOS and default power voltages. So I'm thinking this pre-built tower is fairly good, but will need at least a GPU upgrade in 2 years from now.