Yea, depends what mods your talking about. I don't know one person I've met on here that hasn't done, in some form or another, some personalization to their car.
Myself, well, I guess I'm placed in the not so smart catagory. I'm going balls to wall in modifing my car (see sig below) when I could have paid most of her off instead.
Think most people would take the middle of the road. Do some basic mods that interest you the mosts, and paydown what you can on your car.