Well let's see if I can recall all the items...
I paid $5500 for my bike used, had Scepter pipes on it already. Airbox elimination kit, $300. Nology coils, Hotwires, iridium plugs, $230ish. 904 from bonnevilleperformance, already sleeved cylinders, with Barnett clutch springs I think $700. Had a spare head to get worked, port work was $200 and valves were about $200. I think I got the head I had ported for $130. All installed for $400 at the dealer when I dropped off the bike and a box of parts. Traded my stock head for the carbs and intakes. $500 for the hardbags, $700 for the paintjob, $300 for the Corbin front and rear. Progressive suspension front and rear, $340. All that right there gets me to $9500 even. Even with another say, $2-3000 for everything else, the end result is something that is exactly what I want, every piece picked out by me. And, the best part is, I paid cash upfront for the bike, so I was able to buy a piece here and a piece there over a couple years instead of trying to finance payments and do mods at the same time. I'm sure the monthly payment is a big factor for a lot of owners when it comes to deciding whether or not they will buy some of the costly performance upgrades.