If you want to end up playing rock, soloing, etc, I'd recommend going with an electric guitar.

An electric might cost you more in the beginning, since you'll need to buy an amp, too...but it's easier on your hands when you're just starting out than an acoustic guitar, and you'll probably end up buying an electric later on, anyway, so you'll save some money in the long run.

An electric guitar sounds fine playing without drums...and when you do start playing with a drummer, your guitar will actually be able to be heard over the drums.