Hey Venio,
I have a TEAC A-L700P (a tripath amp that generates 30 watts vs. 10 watts from the Sonic Impact unit) available here gathering dust in excellent condition.
The Sonic Impact unit is best with a regulated AC power supply or sealed lead acid DC battery. The TEAC needs some kind of power conditioning to excel (the more the better, and balanced power makes it almost a miracle at it's price) - otherwise it's mighty average sounding.
You didn't mention if you have a pre-amp already, but both T amps sound best with one - bypassing the internal volume control by setting it to max and using the preamp to attenuate the signal.
But, the power differential is substantial...and the TEAC has three channels if you need them (currently configured with two channels...the 'center' board has been removed to ease strain on undersized power supply)
$95.00 + shipping takes it if you want...just PM me for details, etc. It has original box and what TEAC calls a manual....I'd call Kleenex ;>)