There are a number of low cost micro amps that are pretty good to get you started. Not high powered but enough for playing at home. I have Marshal MS2 and MS4 and a Vox AC1 bass amp. The Marshall MS2 you can clip to your belt and I have actually played out with it. I got the Vox for my U-Bass but it also works well with my Risa concert to give a good "clean" sound. You can get a slight overdrive sound with the Marshall amps which can be quite effective. If you really want a full on overdrive sound though, you need to get an effects unit.
There's always the Roland Microcube if you want to spend a bit more.
You can certainly have fun with a solid uke and that Mahalo will certainly attract attention. It's distinctive and looks great.