I'm not entirely sure all of eD's amp problems are behind them. There's a lot of activity on avsforum.com that indicates they have some current issues as well. Caveat emptor.
A couple of other options that spring to mind immediately are...
Emotiva
X-Ref 10
BIC
H-100 and
F12
Cadence
CSX-12
Polk
PSW 505
Premier Acoustic
PA-120 or
PA-150 even.
These represent a good cross section of options: 10", 12" and 15" drivers, large and small enclosures, bass reflex and acoustic suspension. If none of these work you can check out a
budget subwoofers thread I maintain. It's for subs that can be purchased for $300 or less, so it might be below the target you're looking for, but there are a few solid options listed their.