I recently purchased a used Peavey Supreme amp head at a local pwn shop.

Is it worth anything????

What kind of cabs would go well with it for a hard rock tone????
I'm not sure what it's worth, but any 1x12, 2x12 or 4x 12 cabinet should work fine as long as the impedance matches the amp. If it's a 4 ohm amp, you want a 4 ohm cabinet.

Here's the Harmony Central Review. The Peavey TransTube technology is a bit better than straight transistor, but still can't match tubes so don't expect it to be the greatest sounding amp in town, but according to some of the reviews it does pretty well.

Now that I've had a chance to look around a bit...

According to what I've been able to find, it's an 8 ohm amp, cost around $450 new at the only place I found a price listed.
Hmmm...I wonder what this button does...