Well the thing is, I had 2 GTX 285 from asus with this Super ML cap that supposedly gives better oc capibilites and lower temperatures, but they have sooo much coil squeal, that I have to send them back, and I'm trying to find a replacement.
I have a feeling that if I just get 2 new of the same, the whole situation will repeat itself.
Really depends on the card. There are some overclocked ones like the XFX XXX edition was quiet an overclock that would be hard for most people to get on their own without knowing what they were doing (and given it was on air cooling as well)
other time it really isn't worth it as almost all graphics cards (or motherboards.) come with seriously easy to use overclocking tools that are just moving slider bars. Many companies also still cover you if you overclock so long as you don't do anything stupid.