Rob,
The dent guys can work with aluminum but as EP points out, the trick is to find a GOOD dent guy - not just ANY dent guy. Aluminum experience would be a big plus.
To get to the back side of the dents you mentioned, the dent guy will need to drill one or more holes in the fiberglass underneath. There is some padding up by the wheel arch and he/she may be able to drill a hole underneath that so that it is hidden when done. Also, it goes without saying, try to get by with as small a hole as possible. Even if it is "in the open", you can likely "hide" the presence of a hole by sticking a plastic button christmas tree into it.
To find a good dent guy, I have a couple of recommendations. First off, you may try a post over on
www.nsxprime.com board. Historically, the NSX guys were a good bunch although the median age as dropped a lot with the value of the car. Nevertheless, the NSX is also an all-aluminum bodied car and maybe someone over there can recommend someone in your area.
Failing that, I would visit a couple of higher-end car dealerships. See who they use. Try to talk to the techs and not the sales people. In terms of service, the Lexus dealerships have some pretty high standards and are geneally approachable.
Most of all, sleep well. If the dents are small and the paint is undamaged, I'm sure you'll get them out and no one will ever be able to tell they were there.
Congrats on your purchase. Take it easy driving the car until you are used to it. HP (aka rear wheel spin) is VERY much a funtion of weather. Now that it has cooled off a bit it is really too darn easy to light those rear tires - sometimes when you don't want to.
