10" subwoofer around $500, used or new?


I'm looking at a 10" sub for a 20'x11' room (in an apartment, hardwood floors).
Mostly for music (and 5% for movies). 

How much has technology improved?

Should I got for a used $500 sub which were original $1,000+ ? Eg: 
- Rel strata
- Boston PV1000
- Totem Dreamcatcher
- MJ Accoustics 100 Mk II
    ** OR **
Today's subs around $500 new will give a better sound? 
- SVS PB1000 10"
- Martin Logan Dynamo 
- Klipsch R10SW 10" 

Any other suggestions for new, or used sleepers to look out for?

Thanks!
zordex
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Hey keithtexas, thanks for the heads up, just ordered a pair on amazon. 

george

Check out Speedwoofer.. They have an excellent sub @ $399.00 shipped that is incredible. I purchased one for my Magnepan .7's and was more than impressed. I plan on purchasing a second. Their customer service is outstanding, I talked to the owner on the phone for set up advice. Don't let the low price fool you..

@jetter - you're welcome.

I'm not sure what the difference is between that one and their SB-2000, other than the SB12-NSD has a 400 watt RMS amp vs. 500 watt on the SB2000.  I think they must be clearing out the SB12-NSD to make way for new models. Regardless, 5 yr. warranty is great and they have a 45 day trial after which SVS will still pay for shipping for you to return them. Tough to beat, everything considered.