I have two Portabands, a HF chopsaw, and older Taiwan 4x7 bandsaw, and an Evolution 9" dry cut metal saw. All have their uses and advantages/disadvantages, but if I could only have one, I'd probably stick with the 4x7 bandsaw. Its the easiest to use, very quiet, and will cut while you're doing other stuff. Just spend the money on a good one, as the cheap ones will need tweaking out of the box to cut straight.
Honestly, though, it really depends on what you will be cutting. For a lot of people, the chopsaw is fine...and it's certainly the cheapest.