Hi Brett, I would choose the AMD processor. The Pentium D processors are the first generation of the true dual core Intel processors and they had heat problems.
On the other hand choosing the Pentium D processor with the socket 775 will allow you to simply upgrade to a Core 2 Duo without too much money.
I would go with the AMD, great for gaming but atleast a gig of ram is needed... If u were comparin AMD 2.4 with the Pd dual core extreme, then amd's won't stand a chance...