Video Cards and Overclocking....

You can overclock now. The only reason you would have to change anything later is if your power supply can't handle that on top of everything you're going to add. This... is likely.

Ok cool... I planned ahead and I'm already using a 2kw psu so I (hopefully) should be all set.

  I didn't even know they had 2k.

Me neither... I've seen 1200W, 1250W, and even a 1500W or two, but I've never seen a 2000W.

You should be fine OC'ing the CPU and memory now. The video shouldn't be affected so long as you stay away from adjustments to the PCIe clock.

double post, answered in your other thread

I'm always skeptical of these ,I'm getting 3 gtx 480's in sli, posts.  

newegg had a 2kw PSU for a while (outside of case unit, sits on floor) and has 2 outlet ports

though keep in mind for that much power the standard 15A house line, you would need either to hook it up to 2 different circuits in the house or have a 20A line in the house

Me too, but hey, some fanboys, I mean loyal customers, are stubborn like that. =P

I'd say that's excessive, but of course if you're wanting to get 3 GTX 480s you probably don't care ^_^. I kind of am interested in seeing just how much power 3-GTX480s will draw under load, but I think we'll have to wait a while on that one. I don't think any reviewer will be sent 3 of those monsters, unless of course they are expected to write a favorable, very favorable, review. It's not like any reviewers do that  

well isn't the TDP supposedly 295W? Just giving you an approximation that's about 900w just for the cards, then you have the rest of the system. 1500W PSU minimum i'd guess. I don't think it's worth the power consumption honestly...