Cooling system maintenance is not a "mod". It's maintenance.
As far as additional mods, I might suggest: black out kidneys, I like the look on a white car, and to be honest, I think updating the style 44s, I also updated to a newer stereo that was Sirius compatible and added the OEM sirius module, it's been one of my favorite mods.
In addition, would you post a pic of trim? I've been rocking wood trim for six years now and would definitely consider swapping with you!