No SLI required go for P5W fastest at same clocks ...
If you need SLI go for Plus board, here ( belgium is has a lower street price) and it performs the same as the non Plus edition , plus has better capacitors but a Hybrid chipset. If the altter doesn't bother you go fo r theplus , will be better in the long run ....
all boards should get easy overclocks around 400FSB region, P5W is limited in higher FSB , if you need more FSB go for 965 chipset or for the Nvidia solutions !!