Could you point me in the right direction of where I should start?

Here is the link.  I am looking for something like the 1x12 on here.

http://tech21nyc.com/pe60.html

I have a sansamp gt2 and I wanted to run it through a poweramp like the Power Engine by tech 21.  Does anybody know of a poweramp I could make that is similar to that?  I am new to amp building but I have built alot of pedals so I really dont know much about amps.  Thanks for any advice!