Best place to sell custom computer

Hello everyone,

I'm considering selling the workstation I built for myself and putting it towards a 15" MacBook Pro, as someone who works full time and goes to school, this makes more sense to me. Anyways, I spec'd the thing out quite nicely, I think, when I built it last summer. It a has a 6 core Xeon processor, 16gb of ECC ram, water cooled, solid state drive as well as a 1 TB hard drive for storage and BluRay drive. All wrapped in a non flashy Corsair case.

I was hoping you guys could point me in the best direction to sell this thing. I have somewhere close to $2000 in it. I know I'll probably be lucky to get $1500 for it, but wanted to know where I could find the best target audience to sell to. I'm going to put it on craigslist because that's free. But other than that, is eBay any good for stuff like this? If so, how do I make sure people who are looking for it see it?

Thanks in advance!