Just to clarify - I want it to play with, to practice mic technique (which is a different type of singing), and to use outdoors with friends etc. So I want a "busking amp" rather than actually looking for an amp to busk seriously with. Sorry that wasn't clear at the outset. I don't need amplification in order to be heard - but I also think that belting everything out isn't the be-all and end-all. Amplification does wonders for quieter songs & that's what I want to explore.
Thanks for all the info.

Kris