Cobaltman...
The tourpak can be made detachable...there are a few threads on all the things needed to do that, but as was mentioned above, I would go with a different Amp setup if doing so. Personally, I like the TP on all the time, just because it's more convenient to get in and out of when scooting around...you gotta have a place to put "stuff" and it's just easier to get in than the Bags, IMO...but, I have a passenger more often than not, so that makes a difference.
The speakers on the HK system are about as good as it gets right now for 2ohm speakers. There are some in testing now that will probably be better, but unless you change out the amps, speakers, etc, it's probably not worth changing only the speakers at this point in time. You might notice a bit more clarity at speed with the midrange tones, but it would not be a significant difference. This was told to me by someone here on the site who knows what he's talking about, and not just my opinion.
Definitely have the SERT, Pipes, and SE "Roll Your Own" A/C done immediately. You'll still be lean, but not dangerously lean, and when you get the 1K on it, have it fine tuned.
For looks, I think the Chrome Inner Primary is one of the most significant pieces you can add...it's also a lot easier to keep clean. While you've got them in there doing that, and especially if you ever think you might want true duals, put a chrome starter on, and sell the takeoff on e-bay as new...you can recover about 1/2 the cost of the chrome version.
LED strip on the back of the tourpak from Custom Dynamics is a good looking piece and also a safety thing as well. The dealer won't know what the hell you're talking about on that though, so just do that yourself.
I personally think the seat (comfort wise) sucks, but your butt will let you know about that soon enough...some people love it and never have any issues. The Corbin was the best money I've spent on the bike.
Chrome headlight/aux light/turn signal trim pieces add a touch to the bike that looks nice, I think. Visor or Plain..your choice.
Clearview Windshield...best money you'll spend on comfort.
There's more, but that will be a good start...