I may be the wrong person to ask because I bleed Soundstream, but you can't go wrong with that amp. It performs very well.
I also would recommend the D Towers. I own (12) DTR1.3400Ds.
Sinse you already have a Power Acoustik amp, the Epsilon Family has subs that would work well with that amp. Checkout any of these links:
http://www.poweracoustik.com/pa2011/subwoofers.html
http://splusa.net/products.htm
http://www.precisionpower.com/html-version/subs.html
http://www.soundstream.com/AudioProducts/Subwoofers/subwoofers-main.htm
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If I remember the specs on that amp it puts out 1,200 watts @ 1 ohm, 900 watts @ 2 ohm & 600 watts @ 4 ohm. I maybe wrong, but I'm pretty sure. I have had a few drinks since the last time I played around with that amp.