What about the REL grabbed your attention?
Generally, most Subs these days from any of the Sub Specialists we usually recommend will meet those two requirements, ported or sealed. The beasts we usually recommend are: SVS, Hsu, Monolith, Outlaw, and then Rythmik and PSA. The RSL Speedwoofer is also generally well liked and respected for its size, cost and performance.
REL is not disliked, per se, but they tend to not represent a great value as they are, perhaps, overpriced for what you get.
I'd recommend checking these brands and seeing which ones match your usability needs.
All the Bass-heads here will gladly chime in and help out, too!