Here is why, and BTW, these are facts!
1). Intel Pentium 4's are 32bit! AMD64's are 64bit, meaning they tranfer twice the amount of information at a time!!
2). P4's use 20 Processing Pipelines, Opposed to AMD's 8! (More processor pipelines, the more latency)
3). P4's do half the work per tick as an AMD (2 ticks to every cycle, cycle also known as 1 Hertz [Hz) Thus, the AMD's speeds can be lower, and thus, they produce less heat and use less power, and you can overclock them really well!
4). Intel's Processors are overpriced! I can get two AMD64 Processors for the same price as some Intel P4's out there! And the AMD64's are twice the performance.
I know you said stick to Intel, but I wouldn't if I were you!
AMD just has FAR TOO MANY advantages over Intel right now!