Well, the Sewastopol look like a really nice option, but still built around the in/out (FX send) idea. Also, there is only a release control and no compressor. I think there no real competitor to the AP-1. Maybe this : http://sputnik-modular.com/efpreamp/ but I’m skeptical about the specs.
For the AP-1, here is a part of the description for the preamp section :
“The preamp section consist of a low noise /high speed gain booster for signals to an adequate level for the opto compressor. Two audio inputs are accessible; the mic input provided by a balanced XLR socket and instrument input provided by 1/4 ‘’ single ended socket. The mic input can be powered by the phantom voltage (48 Volts) for driving condenser microphones. The mic amplifiers wide gain range (from 1 to 71 dB) is ideal for amplification of week signals (ribbon microphones and dynamic microphones) and a high output level condenser microphones. The instrument amplifier has 6 dB lower gain range than the microphone amplifier and it’s ideal for amplification of signals from high impedance sources, such as guitar pick-ups, piezo-transducers and other weak to moderate level signal sources.”
It looks like hard to beat! 