XIGMATEK and Q6600, which ones for some overclock

[GeezerMan]

I'm browsing Newegg's XIGMATEK coolers, and I see some with rebates. Maybe time to grab one. I might overclock this Q6600 rig I built some, but not extreme overclocking. Super duper cooling, like the S1283 is probably not really needed. I see some posts where people talk about certain coolers being better for quad cores. Some of these have the 4 pipes, some have 3. I do like the exposed heatpipe versions. Anyone know which of the XIGMATEK is best for quad cores? Im leaning toward the S963 or S964 . Thanks