I haven't done the 2 things you mentioned although I have thought of doing a Daymaker headlamp. The stock low beam is not very bright at night.
Some things I did do are... Rush headers, Rinehart 4" mufflers, SE Ventilator AC, SE Race Tuner with bike dyno'd, passenger footboards, 4 point docking with sissy bar, LA Chopper 12" bars with chrome housings and braided lines, the rest is pretty minor stuff. I will say besides the race tuner and making the bike sound better the LA Chopper bars were the best thing I did. My arms rest straight out while riding and I don't feel slunched over like I did on my old 2009 SG with the bars so low.