For modellers like the Line6 or GNX4, I would recommend a tube amp. You can't go wrong with the Mesa 20/20 or 50/50. I have a Carvin TS100 (50/50) that I use with My GNX4. It is awesome and probably the best band for the buck.
Crystal clear and colourless, which is what you want.
Crystal clear and colourless, which is what you want.