Nick,
+1 on the Eden WT-550. I picked a used mint one up several weeks ago from a TB'er and it's a great head! Much better than I expected. Plus it can go down to 2 ohms safely.
A slight word of caution on the Schroeder, at least the 1210 model. I owned one for a couple weeks and as everyone says, they really cut through in a live gig. However, you either love them or hate them. The 1210 just sounded to honky sounding to me. IMO not an inspiring cabinet to play in front of.
As Ken stated earlier, the Berg 1-12 does lack some of the low end bass response of the Berg HT-210 (and even the SWR Jr. III), but the mid-range growl put out by that cabinet is too kill for! IMO the sacrifice that you make on porting the 210 cabinets for better low end is that they typically break up sooner due to the extreme speaker excursions required to pump out the lows (check the speaker cone movement on one of those cab's and you'll see what I mean). The Berg 112 cabinets are ported in a manner that cuts some of the lower freq's, minimizing excessive cone movement and the result is a tight punchy sound capable of fairly high clean volume.
The Berg sounds huge in the venues that I've used it in but if I ever play it in a room where the acoustics caused it to sound too thin, I would just suppliment the low end by running a DI through the mains and utilize the sub-woofers.