I don't have an aluminum trailer but just from afar the InTechs sure look nice.
ATC seems to have a good reputation as well
I don't know where you live but Rich's company sure seems to move a lot of trailers all over the country, I have to assume he prices aggressively.
http://www.rmtrailer.com/
I bought my Classic many years ago from Flying A and was treated well.
http://www.flyingamotorsports.com/
Let us know what you decide on.
Bill