from the original problems with car:
vibrations -> all 3 motor mounts completely useless, after changing em the difference was like night to day, anyway those were the aftermarket ones and the tbone failed again 3 months later, luckily it's cheap and i was able to change it so it cost me 25$.
jumbo jet sound -> well that was something around exhaust manifold that ruptured, with my car knowledge at the time i didn't even understand what the mechanic has explained to me :P
I had problem lately with wiring to the battery, solved in this thread:
ok, now that's a weird one
Currently I'm looking at belt and belt tensioner, and it's because of two things
1. i get the typical 'old belt' noise when turning on/off the AC
2. there is some vibration in motor that seems to be related to AC speed