I bought my car heavily modded and repainted with an oil leak. I paid $22.5K which I thought was little high, but I figured it had many parts I'd be buying anyway.
Keep in mind, an engine rebuild is rather expensive even if you do the work. Just know that going in especially if you're going to start making serious hp.
I wouldn't look a factory hp ratings on any of these. All the mods needed for hp will be needed on all the models.
The sunroof isn't really a reliability issue, it's just weight up high where you don't want it and all US cars (AFAIK
) came with them.