Congrats...many folk would love to be walking in your moccacins right now. Ultra...the Flagship of the touring frame models imho, awesome.
I don't have an Ultra, but it will probably be my next machine to buy. And along those lines I have posed the question to myself..."Randy, if you bought an Ultra how would you personalize it...?"
Here is my take on this scenario. IMHO the Ultra is in some ways the most challenging machine to personalize. Perhaps I have narrow thinking...but that is just me. But seriously I would largely leave it stock except for this.
Firstly, the stock pipes would have to go bye bye. The pipes would have to be replaced in order to get some sound. I would probably go with SuperTraps with fishtails. Then I would want to replace the air filter with the Scream'in Eagle replacement kit, hence to let the machine breathe better and also it does give a little more power and it looks better also. I'm nearly certain in doing these two changes you will have to do some sort of "downloading" to the computer of your machine.
In addition I'd add the HD larger luggage rack for top of the tourpack. Then since it is a touring machine, I would have to add the HD communiication devices so that you can talk to your passenger and your passenger can hear your tunes. With this you should be able to talk on your CB to other folks if they are on Ultras via CB Radio.
So in essence...lookwise the Pipes and tourpack rack are really going to be the most noticed add on Items.
Nutshell, it's your machine...hence suit yourself, but the above is what I'd most likely do. In the bigger picture of add ons..what I would do is very modest compared to what a person can do.