Lee touched on the budget aspect, it is hard to recommend a saw without knowing the price range. Another big factor is how much you will be using it. I believe in buying the best tools I can afford, even if it means shopping used, often people buy tools just in case they need them, and you can find a good buy on used equipment. Features to look for include a good quality guide, conveniently located controls that are strong and durable such as your tilt mechanism, knobs for raising and lowering the blade, etc. A good quality saw is more enjoyable using than the cheapest out there. One saw I would recommend is made by Ridgid, folding compact model, it may be a little more than ones you were looking at.It is very similar in design to the Bosh another good quality compact saw but pricier. On any of the compact saws though, I would recommend also a thin kerf quality blade such as made by Freud or Forrest, it will put less strain on the motor and allow it to last longer and will run smoother with less vibration, which can be annoying on a motorized saw!
Dave