if you want cheap sql (if you want to call it that) get the swr 1221 (dual 2 ohm type r) you can wire down to 1 ohm and make the most power of your amp
if you want QUALITY...ahhhh RE...take advantage of the group buy if it is still going on (i'm not even sure) i would reccomend an SX
if you want to spend a lot of money and do exactly what an re can do (IMO the RE SE/SX is a lot "better") get a JL. I like jl almost as much as audiobling
my opinion on jl, overpriced and overrated. Get an re...you won't be disapointed.
i own a 10" type r with a box custom built by mark potts (basically the type r expert) go to thecaraudiobox.com and check him out. I am about a high 130 low 140 right now...i'm just guessing. I'm running a hifoinics 1605d amp...pretty overpowered for that little 10...but it's ok. sounds great
if you get a type r...definetly port it, the difference in that sub from ported to sealed is like night and day. I owned a ported and sealed box both running that same amp and sub...and words can't explain how that box lit up that sub.
overall, i like the type r's...i'm not some crazy teen worried about the hype...i just want to sound good and be moderately loud. The type r did it for me. I've now owned over 12 of those subs (I tend to blow VC and cones a lot because I always overpower my subs either from clipping (back in the day before i iknew whats up) or from just over-excursion)
Pm me if you want to know more...I am very educated IMO on car audio.
edit: and i've also owned the new and old model subs. the surround on the new ones rocks my socks...literally. they take so much more than rated power (over the old ones) and they excursion like crazy. I should have a video up soon, i just have to get my digicam. I have quite a long excursion type r...if there is such a thing!!
basically...get a type r in a nice ported box...go onto caraudio forums and hit up moe lester and he will hook you up with a nice one. or just go to thecaraudiobox.com