I'm always leary of Tigerdirect barebones rigs. Mainly because to get the cost down they either a) use outdated product (like they used to sell Pentium D's instead of a Core 2 Duo etc) b) use no name brand case/psu parts or inferior quality ones.
I'm a stickler on PSU's. Yeah, that $30 PSU may run your computer, but will it last and when it goes is it going to take the rest of the components with it?
Cheap cases are fine IMO. But PSU's power every single component in that computer and their quality is often overlooked. It's providing the blood to your system.
So for that reason, I don't recommend their builds, unless perhaps it didn't include a PSU.