Something like the boss GT10 or one of the newer pods could get what youre after.
With the 4 cable method you can have things placed in front of the preamp and in the loop, then you can also choose to use a preamp model from the pedal and bypass the amps preamp if you wish. Im not familiar with the Rp1000 but i guess thats the same deal with them.
Would be better than any of the other amps youve listed I would think.
