The line6 spider modelling amps, IMHO, are cheap, and very good value for money.
Of course, the tone purists will flame me for it being 'digital' and 'fake sounding' and stuff, but to the average listener, there is not much difference.
I would not carry it to a gig, for digital modelling tends to thin out at higher volumes, but it makes for a more than valuable jam/practice amp.