Bass...? In compairison to the difficulty of playing a bass, you should try a jews-harp. *Twang twang twang* And if your looking for an instrument, Bass is merely backup sound much like the ambient droning of a hive of bees rythmicaly slaped against a wall. I sugguest a lead guitar if you decide to go into the string & pluck family...preferably an electric classic style so you at least can have some diversity in your music.
Simply put, guitar is over played, over rated, and most people spend their time modeling after other peoples music just to learn how to play and mess up their fingers. Ugh, uncomfortable, yes, but easy enough to pick up once you learn riffs and cords. Dont expect Mozart from it though.
Another handy set of tools, all be it more expensive, are the drums. You could probably see over fifty or so various sorts of them in a local music store. From hand drums to electric drums..they have it all AND can play music now as well as keep rythem. Very awsome.
BTW did you pick something yet?