VHT/Fryette Pitbull Ultralead.
Diezel Herbert is a fantastic amp as well, and I'd say modern sounding, very hifi.
ENGL special edition (the 4 channel one with a million options)
The Synergy stuff. Modular preamps (as per the old randall/egnator MTS (you can use those modules too)) where th preamps are now licensed and designed from Diezel, ENGL, Friedman etc. with each module having 2 channels effectively. They do an engl savage module, and a diezel VH4 module and a soldano slo... basically, in the price bracket you're looking at, it might be wrth consiering them, as you can just swap the modules in and out. It's also possible to mod old randall rm100 amps to be able to do channel switching and fully use the new features of the synergy modules.
Other than that, loads of options really, most heads in the last 10-15 years have more than enough gain.