because of some compatiblity issues with AMD processors Ive run into in the past.
Today, if you puy a good MB, any AMD based PC will be as reliable and compatible as any other P4 systems. In the past, many people paired AMD CPU will low cost or budget MB, this was the major cause of "incompatibility" and crash.
And you are right about the P4EE is doing better than AMD-FX in some applications. But, you have to ask yourself what you will do with your PC? If you mostly do Audio/Video the P4EE may be worth the extra money. But if you mainly build this PC for gaming (with an X800, I think you will play a lot), then the P4EE will not beat an Athlon 3200+ (in many games) and the Athlon 64 3200+ only cost 255$US (You can buy 4 A64 3200+ for the price of 1 P4EE).
If you really want to waste money, go for the P4EE, but don't cry in a couple of months when you will have to buy a new MB/CPU/RAM because your P4EE don't support 64bit Windows. You have to think about this issue too! When you buy a 1000$US CPU you must expect ROI (Return On Investment) in the long run and the P4EE might not give you this because it don't support 64bit.
I'm not telling you to not buy the P4EE, but think about those issues before getting that CPU. The platform is almost obsolete, the CPU is not 64bit ready, it cost a lot more and don't perform well in games compared to an AMD CPU that cost only 255$US... And so on...
Just hope I dont forget about having to unplug it and yank it out of the motherboard by accident! Ouch!
This will not happen if you don't screw the connector behing your case.
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What's the <b><font color=green>AMD Mobile Athlon 64</font color=green></b> overclocking potential? <b>It's huge!</b> Humm... Maybe not that huge...