guitar amp+speakers vs. PA

[Erik Ljones <eriklj@stud.ntnu.no>]

As I can't afford both, I'd really appreciate it if someone could help me
compose a rig for looping guitars that:
A) Sound good for playing electric guitar in a straightforward manner, and
B) is able to amplify my HEAVILY treated, synth-like guitar signals.
Everything has to be in stereo, by the way.

I currently use a Rocktron Voodo Valve tube driven pre-amp (with a speaker
simulator & digital effects that I usually bypass) and a Roctron Velocity
power amp. I've tried this setup with different speakers made for guitars,
and the problem is that it wont really convert the frequencies not in the
guitar domain into sound. Are there any ok sounding speakers made for
guitars on the market that will do this? Or do I have to run my pre-amp
w/speaker simulator into a mixer in order to obtain B). What equipment
should I consider in the latter case?
What I'm looking for, I guess, is a solution that gives the best compromise
between  A) and B). I'd really, really appreciate any feedback and advice
you could give on this. If you think this is a bit off topic, please feel
free to e-mail me privatly. Thanks

Also, someone mentioned that using e-bowed guitars with a vocoder might be
a good idea. I have tried this, replacing the synth with guitar signals,
and it works ok if the signal is really thick and wide. Try placing the
vocoder after a loop with lots of (processed) layers. It gives the vocoder
a better signal to work with. Again, thanks.

Erik Ljones (Norway)