Hi,
I've been shopping and have pretty well settled on the Hobart Handler line, too. They just appear to offer the best value and latest features. But, there are other good brands in similar price range. I believe Hobart is made by one of the other major manufacturers, maybe Miller.
Duty rating is one of your main considerations. In other words, how long can you run the welder each hour before giving it a break. Some 120V have 20 or 30% duty cycle ratings. That means basically you can't weld 80 or 70% of the time, must "give it a rest". 230V often give a much higher duty cycle, and the priciest welders can run almost continuously.
MIG is probably the easiest type of welding to learn. The suggestions abouit books are a good idea. Also, you might consider a class at a local community college, if that's an option. It would help you get up to speed quickly and you might even be able to work on your own projects in class.
Finally, I agree with the suggestions about gas shielding. Flux core wire (gasless) is primarily intended for outdoor use, where a breeze would blow away gas shielding. It's not nearly as neat and requires a lot more finish work (if that's important) than gas shielded.
Have fun shopping!
Alan