Myles from racecmp wrote a great post in a thread some where that covered alot of the popular R-compounds, a number of which are DOT legal. Of course the RA-1 is DOT legal, puts up with heat and has a slow wear rate for a R-comp but you have ruled that out of yoiur choice. Obviously if you don't want the RA-1 you won't consider the sport cups.
What treadwear do you consider streetable? It sounds like you are looking at the same selection of tire that are used for Street Touring autoX classes.
These will work fine for HPDEs, although as soon as you try an R-comp you'll get hooked... pun intended.
Are you looking for just a dry tire or one that will suit you for both dry and wet at HPDE?