That's up to you. The best gear is from icc25. ICC10 also happens to drop 264s from trash. It'll take you quite a while to get enough Emblems of Frost without raiding.

Personally, I occasionally raid with my guys to pick up good gear. 232s from heroics just won't cut it for me. In the past I've run 2 or 3 guys in a raid, but the ICC fights are difficult enough that I don't do that yet. It's pretty common for me to bring 3 dps to an Ony25.