I didn't chime in initially because I haven't modded out my bike much at all. This is a fun thread though, and I too, would like to hear from others.
I fell in love with my V Star 950 for exactly what it is. That being said, there are mods I want to do. Like, I will be getting a MS batwing this year, (love the fact that it's quick release.)
So far, the best mod I have done... Koso heated grips!! Heated grips are a *must* addition to any bike I will ever ride, because I have cold hands. LOVE them. I've used them even in the summer, if a rain storm pops up, or night temperatures fall.
Keep moving, learning, loving, and living.