Yeah, cost is why I'm mainly considering the Violin, but size is what's concerning me. I have fairly big fingers, so I'm not sure if I'd be able to play one. I can play guitar fine, but I don't know how far apart strings on a Violin or Viola are. Simply due to cost, I'm saying Upright Bass is out of the question right now.
Yeah. I'm no expert, but where on earth would you keep a double bass or a cello? Violin may be a good choice because it's cheap and I imagine it's much easier to find competent violin teachers/tutorials whatever than for the other instruments.