synths/keyboards and amps

hi, i'm Adam and i have a problem. i just blew my entire wage packet on a new synth. i have a guitar amp but i'm led to believe that playing sythns through guitar amps is very bad. i was wodnering what do other keyboard/synth users use? does anyone know of any decent cheap keybaord amps? for my live setup i'll be using the synth and a sampler with a midi keyboard. i'm wodnering also what's the best way to hook these up and if anyone has any general advice or tips i was planning to just use the guitar amp and a wee mixer to get the levels right for the two. then mic it up to the pa for gigs. i'd rather have an amp than just plug straight into the pa. cheers