ok listen , out of the 800 and 900 series .. the 900 is much better .. as it is a presler core cpus with 65 nm fab process with large 4 mb L2 caches ..
they perform much better than 800 series and dont heat like 800 series .. i mean they run relatively pretty cool ..
now there's a catch .. there is a new 805 pentium d .. which is 2.66 ghz 533 fsb with total 2 mb cache buffer dual core cpu .. its like 6.5 k in price and performs good too .. and its overclocks well too ..u can go for it if short on budget '
also 920 .. 2.8 ghz 800 fsb 4 mb L2 cache is damn good .. performs well and overclocks very well .. 13.5 k or something ..