my pick of those three would be the L7. they get low, they get loud and even ported, can be quite musical. i don't think they'll touch the other two choices in the musical department, but i believe they will more then hold their own.
second choice? i don't have one. while either would be a good decision, there has been more then enough comparisions given between those two for one to make up their own mind.
but, mark, i can't believe you'll choose a sub without direct comparision. i understand your type r vs sx stance, and have no issues. but to say that the r's will beat the L7's without proper testing, comeon. too many people still use the L7's in competition, and are winning, compared to other brands to generalize like that.
btw, when squeak gets the soundsplinter rl-s to demo, you need to get over there and try it out. i got a 137.9 legal out of it in 2.5ft^3 tuned to 28hz, burped at 34hz, getting ~1200wrms from an orion 2500d (wired to the only impedence available, 3.5 ohm) off a factory electrical system, single run of 4 guage (the orion won't live in the trailblazer, a hifonics nemesis nx750d will) and the factory bose headunit, which still attenuates the bass as the volume goes up. i'm going to try and meter the rl-p in the same enclosure/setup to get a direct comparision sometime this weekend.
wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee //content.invisioncic.com/y282845/emoticons/peace.gif.2db28b618ed8d1964ebbe2f5021d2c39.gif