door doors doors! Best bang for one's buck?

[Evan Holly]

I'm closing on my first investment property at the end of the month, and it's looking like all the doors will need to be replaced (about 8).  Anyone have suggestions for standard and affordable doors that aren't gonna get holes in them from a single (non-Mike Tyson) punch?

A google shopping search (mainly home depot) has waaay too many choices that all look the same, so I'm hoping someone with more experience might be able to help me out here.

Thanks!