i'm after a new amp, too. i narrowed it down to a valvetronix 50/100, and a vypyr 75. i went out to try both today, but the vox stockist was shut, so i only got to play the vypyr.
wow! sounds flippin amazin! i'm also seduced by the usb connection, and the sanpera 2 'star trek' pedal thingy, that opens up the 400 presets or whatever, and the looper function.
still tempted to try a vox, but i think i'm in lust!