I'm going to be building a new machine with either a Thunerbird/Asus A7V combo or a P3/Asus CUSL2 mix. The AMD route would be a little cheaper, and faster (1.2Ghz vs. 1Ghz). However, I'm really paranoid about getting it set up nice and stable, and that's the only reason I'm considering a P3. Also, I'm worried about cracking the core of a Thunderbird, when putting the heatsink on it. What have you're experiences (good or bad) been like? Let me know if you want any other info about the other peripherals I'll be putting in it. Thanks very much!