Well as long as we're giving other options here, how about:
http://www.dbtechnologies.com/mod_produkte.cfm?pgid=1&pugid=5&psugid=7&pid=58 (hope that link works)
Db Technologies Stage Opera sub 400w rms. (15")
STAGE OPERA 41.15
• 1 x 15"
• 400 W/RMS active
• 30 – 150 Hz
• max SPL: 127 dB
• XLR/jack input
• Parallel output
• HF-Out XLR
• Stereo-Crossover
• Dynamic limiter
• cutoff frequency 100 Hz
• 480 x 500 x 500 mm
• Weight 24 kg/ 43 lbs
I've used this thing for 2 years or more and would not leave home without it!
Though I must say the other options given here may be more suitable as you have 10" Top Speakers.
My set up is 2x 12" 400 watts a side, so the 400w 15" is a perfect match (we play some fairly large(ish) venues.
You might not need that much power though and the 12" sub 200w options might suit you better.
Either way, G'luck!