You'll fall over at the fuel economy of an H3 (which is actually one of the best in class, but still, abysmal)... honestly, watch our posts on here about vehicles we think are good deals... e.g. the Alpha in LA.
I don't know if certified is all that, I had a GM certified vehicle, and, after 2 transmission rebuilds and a bunch of other stuff, they were unhelpful at best (it was a GTO).
Things to watch out for:
buy one that's been a mall crawler, don't ever buy from some like me - I take care of mine, and fix what's broke; however, when I sell my 4x4s, they're used up.
I would honestly look for a luxury package one. You get better colors, and you are far less likely to find one that's been wheeled hard ... dechroming them is a pain, but that's a lot easier than replacing broke stuff.