I am looking to buy a backup head for my SVT CL. I am running 2-SVT 212 AVs (sometimes one). These are 600W 4 Ohm cabs so the head should do 4 and 2 Ohms. I am hoping to economize such that I can. I've found some heads that fit the bill but most are hybrids and expensive. Can anyone point me to an economical SS head?