I will be building a core 2 duo system in the next 2 weeks as well so it's nice and timely.
http://www.fastsilicon.com/content/view/87/27/
" AMD has lost the clock-for-clock performance crown. When we think of the enthusiast looking for the best bang for his or her buck, we have to use different criteria than an OEM would when making recommendations. As such, we see little reason to recommend AMD's Athlon64 or X2 series CPU's. On the basis of price point, even with AMD's aggressive pricing, we don't see enough of a practical difference to sway us away from Core2Duo, especially with the attractive pricing of the E6300 itself."