Best. Mod. Ever. ???

[MWS]

I was curious as to the best mods that all have done, as in "what has added the most benefit?" I suppose mods generally fall into 3 categories:
1- Performance
2- Aesthetic
3- Comfort/convenience

For me, the best mods I have done (as in the ones I am most glad I did), would be:
- speaker upgrade: replaced all stock with Diamond Audio HEX + rear speakers
Why best? I find myself listening to a lot of music, and stock didn't cut it.
- iPod cable (using AUX (CD changer) input on Becker)
Why best? Same as above + I like the OEM look but wanted to add my library.
- padded armrests: While door panels were off, upholstered the flip up arm rests.
Why best? Besides looking much better, the padding is soooo much more comfortable. As trivial as it seems, this might be the best thing I have done, or could ever do. Used a professional trimmer, and the result was totally stock look.

Anyway, what about everyone else?