Solo seat.
Power duals, probably monster ovals or basic slip ons, depending on what sound you like.
Flush mount fuel gauge and filler.
Trim rings - headlight, turn signals, passing lamps
Air Cleaner
Save the rest for a S&S 106 kit or 124 kit depending on how far you wanna go.
I am sure people will offer plenty of great suggestions but save $50 for the fork lock cover. It covers up that ugly part you have to look at while you are riding. Seemed ridiculous when I saw the price but I love it.
Do what you like, that's what's fun about it, learning what is out there and adding what you feel you need/want first. For some it's performance, for others it may be comfort or chrome. Have fun with it...!
I guess like everyone else A/C, tuner and pipes are probablyone of the first changes I make. Also big on ISO-Grips and a seat/handlebar combination that makes riding comfortable. After all, I'll be in that position a lot. Oil cooler next if there's any money left.