Guitar Center has these amp heads by Mark Bass Little Mark II. Phenominal little head I need to get one myself after the new basses come in. They are like $550.

Aslo another nudge in replacing that cab with another 8 ohm. Reading through this thread, there is a lot I could say, I've been doing sound reinforcement over the last twenty five years, and designed the system at our church so there are a lot of considerations to be made. Recently I have downsized my own rig, I am not playing out as much and the majority of the venues (including churches) have FOH support these days. At my church (A frame building seating 1200) I was using an Aguilar DB750 feeding a Bergantino NV610 monster setup. The band consist of a drummer (miced not shielded) two keyboards (FOH & monitors) guitar (FOH & monitored) and my big rig with no PA support I had plenty of volume to fill the house up with my rig alone, but because of stage volume and not over powering the backline, I could'nt get above 3 without over powering the vocals and muscians,and if one turned up everyone would in turn increase volume until it was blaring and sound check was a was of time. Rule of thumb is with PA support stage volume (backline) should never bleed or supersede the FOH volume, so at that level I could hear myself we had a great mix, but people in the last 12 rows said they could not hear me at all. So, I downsized and began using my ThunderFunk amp mainly because it's soooo much lighter, using only a Epifani UL210 for backline while sending DI post EQ to the FOH that hosts bi-amped 3 way EAW concert series mains, and EAW dual 18" subs, now I am being heard and felt in every seat in the house while not over powering the backline or the FOH, and the complements are coming in. I still maintain a monstr rig but the point here is that it is not always necessary or good that you over power your band mates. Although I should have known better I insisted on having my big rig because I didn't want my sound alterd my the inexperienced guys unstairs, but working with them has it at a level now where everyone is happy and levels are under control.
Sorry to derail the thread, but as the OP stated that his hope was to be at a church with 1200 plus capacity, more than likely when you show up with all your gear they may say we have DI and IEM or cans, you can leave all that in your car. After years of carrying gear you will say Thank You Jesus!
Try and select a head that has DI (post and pre) or a good DI box and hopefully you can trust the guys upstairs.