Need Sub suggestions. Whats the best Sub in the $600-$900 range?

Hi everyone,

I am currently looking for some ideas to replace an 8-year old NHT "SubOne" powered subwoofer that has stopped working. I haven't yet figured out why the NHT has failed. The fuse inside the sub was blown. When I replaced it with a new one and turned on my A/V receiver the sub gave out again after a loud groaning noise, and the new fuse was also blown. I prefer to fix the sub if it can be done cheaply (i don't want to spend a lot money if it can be avoided). Alas since replacing the fuse didn't work, I figure it probably isn't worth having an 8-year old sub repaired professionally. So I am asking for suggestions for a replacement subwoofer for the living room. I want to get the best sub (in terms of the highest quality build and sound available) available under $900. If there is some sub that is slightly more expensive but provides a lot more in features or sound quality then that's ok too. So there is a little leeway. So Here are my requirements for a new sub:

Must work with Brand New Onkyo TX-SR876 Receiver. Link
The sub must be of a high quality build, and it must be better than current Subwoofer.

Budget: $600-$900
Side Limits: No Larger than 16x16x16
Room Dimensions: 4000 cubic feet, not including open to Kitcher/Dining Room and Foyer
Primary Uses: 70% Movies, 15% Music, %15 Gaming (PS3)
Appearance Requirements: Black Case (preferably Glossy)
Time Frame: In the Next Couple of Weeks
Listening Preferences: Volume can get quite loud during some Movies

The specs for my current Sub, the NHT, are as follows:

"Vented subwoofer with built-in amplifier and outboard controller",
"Driver: 10" long-throw polypropylene woofer",
"Power: 250 watts mono into 8 ohms, under licence from Sunfire Corp.",
"Frequency Response: 25Hz - 180Hz +/-3db"
"Distortion: Less than 0.3% at full power"
"Crossover: Low-pass continuously variable between 40-180Hz, 18dB/octave, etc"
I have a 5.1 surround sound system with speakers built into the walls/ceilings. The NHT did a very satisfactory job while it lasted.

I am knowledgeable about video equipment like HDTVs, and Blu-ray players. But I must admit that I know very little about subwoofers or speakers. I don't know how to differentiate between a quality sub and a cheap one, and i dont know which specifications are important for producing good deep, clear sound. I don't even know which companies are respected for making good subwoofers (except for Velodyne). So if anyone suggests a sub, I'd appreciate a reason why they think their recommended sub is a good, high quality one. If you guys need more information just ask me.

I'd like to thank everyone that makes a suggestion.

Thanks for the suggestions by both of you. I appreciate it. I am still looking at different options. The only problem with the PB12-plus is that I already have built-in wooden cabinets in the living room. The PB12 wouldn't fit into space designated for the subwoofer which has dimentions something like 18 wide x 17 high x 20 deep. This space was designed for my current NHT (16x16x16). So unfortunately any new sub has to fit into the cavity. I'll try to get a picture of the space and my current sub up in the next few days. Again thanks for the suggestions.

Oh I just wanted to add, my old subwoofer before it stopped working was good/loud enough for my needs for what thats worth. I posted the specs for it in the first post. At the minimum I am looking for a sub that performs atleast as well to what i had, and fits in the space that I have. I just need to figure out if the SB-12 Plus is comparable or better than what I had, and if there are better options. =)