Ok - not knocking the amp you want to use (though you'll find that Audiobahn isn't terribly popular on this forum) but this is simply fact:
RMS ratings given are ~
150w/ch X 4 channels @ 4 Ohm stereo
350w/ch X 4 channels @ 2 Ohm stereo
700w/ch X 2 channels @ 4 Ohm mono bridged
With two 40 amp fuses the most output you could theoretically get from that amplifier (80 amperes current X 14.4vdc input = 1152 watts power) is significantly less than the 1400 watts possible that's claimed by Audiobahn.
So - in bridged mode I would guess maybe 500 usable watts/channel give or take - which is still plenty of power to satisfy a pair of subs.
The current 'goto' sub around the forum is the Alpine Type R. Not trying to get wrapped up in the hype but I have heard some Rs and for the price they are a more than capable subwoofer that fits into your stated $130/sub budget. You could get a pair of these in the dual 2 Ohm coil configuration, wire each sub to a 4 Ohm load then run one off of each bridged amp channel.
The Kicker CompVR is a very capable sub in its own right - and are available in a dual 2 Ohm configuration.
Crutchfield has 'em for $150/apiece so I'm pretty certain you could find them elsewhere cheaper to fit into your stated budget. Be consevative with your amp gains and these could work well for you too.
There's many other options in addition to the ones I've posted ~ I'll leave it to you to do the research. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif Search, search, search! Google and the stickied tutorials around the forum can be your friend //content.invisioncic.com/y282845/emoticons/thumbsup.gif.3287b36ca96645a13a43aff531f37f02.gif