Best processor for intel d945GCR

please let me know that which would b the best processor for the motherboard of intel D945GCR ?

i m currently using E2140 (1.6 ghz) for the same.

Any processor upto 800MHZ FSB will work on D945GCCR, Coz it supports maximum upto 800 FSB.

plz name the processor

^Pentium 4 at 533 FSB or 800 FSB, Dual Core and Core 2 Duo at 800FSB. 1066FSB is not supported on this board.

how much FSB of RAM this board supported ?