Is it wrong to want an RP....
500?
That thing looks sweet and I've read a few good reviews by players already. Sounds like it does everything I originally wanted my GNX3 for. All the effects with out the amp modeling so it can jive well with an amp. The processor sounds like an improvement too.

Comments
I will say that I am currently considering an all tube amp and wish I had kept the RP500 to test with these amps. If you have a good tube amp the RP500 is probably the way to go. I use studio monitors with the GNX3.