I would highly recommend the Vox AD30VT amp. It is around �130. It is 30 watts with built in effects such as chorus, delay, flanger etc. Also have a number of sounds to use the effects on, many are distortion based if you want to rock. Very versatile and well built. It actually contains a real small valve amp which is then digitally manipulated, so you can get a true valve amp effect if you want it. Also has a couple of programmable memories which you can select between with an optional extra footswitch. I have one and can't praise it enough.
http://www.reidys.com/index.pl?submit=View_PLU &PLU=4757
Go and try one in a music shop and then buy online if you like it.