the DD's will probably take the most power. the SS 8"s are pretty solid drivers from everything i hear, i have yet to really play with them, but they are what we were going to use for that challenge. the W7 8"s are probably the ONLY driver i would ever buy from JL. they are flat out impressive, loud, accurate, great sounding and they soak up some power. their only downfall is their depth. but if you can overcome that, they would be my pick hands down. they are going to take more power than just about anything else, and also sound better.
my second pick would probably go to the soundsplinters, then the DD's. the one i would recomend staying away from(only because of the power you have) is the RE 8"s. you would need alot of those to keep up with the power you have. but if you were careful with the gains, could probably be just as loud as the latter with the RE 8"s.
i am BEGGING stereo integrity to come out with an 8" driver, and nick is thus far refusing //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif