Building your own computer. I've done 4 of them. Usually there are a few troubles, but I've been working on this one since 1200 yesterday (31 hours -sleep). I may have to pay some computer guy 80 bucks to finish it. I'm pissed.
But when it's done, it should freakin rock. At least twice as fast as the one I sit at now. Hopefully faster.

I've built a couple of my own, and sometimes it's just not worth it. I have had major compatibility problems in the past. Spent too much time with Tech Support on the phone.