I can vouch for the Vox DA5. It is an excellent amp with good quality onboard FX, and can be plugged in or run on regular batteries, so is super portable.
Excellent sound for such a small little dude...
But it is a little pricey. I'm glad I saved up my pennies though for it...
Musiciansfriend.com or zzounds.com usually have the best price on these.