my first sub question is always, how do you plan to hook them up and do you plan to highpass?
If you can get past the looks the JTR RS1 the best sub I personally have heard that are not diy monsters. Their lowest low pass setting is 60hz… so keep that in mind if you are not using external controls. I am highpassing mine with a Sublime Acoustics K235.
I am not a fan of Rel. too expensive for round rolled off bass. Their top model are probably fine if you want the looks and have money to spend. My JLs had a lot of failures and I would not recommend the brand. They do sound good though. Rythmic and HSU both look like good buys.