Great color you got there! Try and resist the urge to purchase upgrades and modifications other than for your safety if you're going to sell this fall. It seems to be the prevailing wisdom that you won't get much return for most of your upgrade dollars. However, you might want to look at these sites (there are others) for a couple of your safety modifications...
Motorcycle Headlight Modulator - Brake Flasher - Headlight Solid State Relay
Your visibility to others will save your life and I found the install of the headlight modulator and brake flasher was very easy! Another item I've found that has helped on more than a couple of occasions is replacement of the stock horn with one that can be actually heard:
Motorcycle Air Horns : Motorcycle Apparel and Motorcycle Gear - BikerHiway
And never forget to ride like no one knows your on the road with them. Sooner or later someone will prove to you that you are invisible despite your best efforts! Be prepared, always drive defensively!