How do you guys thinks these ep500 and ep600 compared to SVS PB2-plus or SVS PB2-ultra.

SVS PB2-plus cost $1199USD.
PB2-Plus subwoofer with 900 watt rms built-in BASH amp
http://www.svsubwoofers.com/subs_pb2_plus.htm
here is the:

PB2-Plus subwoofer with 900 watt built-in BASH amp
Twin 12" custom TC-Sounds, US made super high capacity woofers SVS designed, full-featured 900 watt BASH (R) digital switching amp Built-in, flush-mount amp configuration (220v. version available)Computer Assisted Design (CAD) enclosure Down-firing woofers with distinctive SVS integrated base-plate Compliant floor mounts, ultra low center of gravity Three tuned, patented 4" high-flow flared porting (in and out).CNC'd and assembled in America, each hand tested by SVS R/D Labs Extra heavy-duty detachable 8 foot power cord Industry leading advanced plural component polyurethane finish. Selectable 16Hz, 20Hz or 25Hz tuning with included port plugs Size: 18" wide, 25" tall and 28" deep. Weight: 140 pounds Frequency Response: Deep and linear better than +/- 3dB to 20hz!

AND HERE IS THE SVS PB2-Ultra 1,999 USD
http://www.svsubwoofers.com/subs_pb2_ultra.htm

Dual TV-12 "Ultra" woofers by TC-Sounds... SVS's best
1,000 watt BASH (R) amp with built-in parametric equalizer
Flush-mount amp configuration (220v. version available)
Computer Assisted Design (CAD) enclosure Down-firing configuration with distinctive SVS integrated base-plate
Compliant floor mounts, low center of gravity Three 4" high-flow flared porting (in and out), two port blocks included. CNC'd and assembled in America, each hand tested by SVS R/D Labs Extra heavy-duty detachable 8 foot power cord Clear hard Maple veneer with solid matching rounded edging Four wood finishes, all with satin poly top-coat, plus textured black Selectable 16Hz, 20Hz or 25Hz extension with included port plugs Variable subsonic filter with, 16Hz, 20Hz or 25Hz and bypass settings Size: Approx. 19" wide, 26" tall and 29" deep. Weight: 190 pounds.

Also with the Paradigm Servo-15 v2. at the price of $2200 CND.

Thanks