NJ 666 wrote:2000 and 2001 I30s are pretty reliable but have a few problems that are expensive: coils,cats,o2's,MAF's coolant seal leaks coolant into iac and it shorts the ecm, motor mounts(electric), If the cats "dusted" themselves it may have scored the cylinder walls and burn oil. I35's were much better but will use a little oil.
The coolant issue can't be that common. I'm not saying that you're wrong and that it doesn't exist, but I've never seen or heard of that happening on a VQ30 engine. One other thing that is common on all A33s though is failure of the power seat motors.
As far as the original poster's question, I'd recommend looking around for a nice clean A32 (96-99) I30. An A33 in the $6000 range is likely to have huge miles on it. I've got an '01 with 82K on it now (purchased with 62K three years ago), and other than routine maintenance I've had to replace an MAF, an O2 sensor, and the power seat motor. All common issues.