Which Mig welder to buy?

My advice, stay away from the Harbor Freight/ Northern tool/ Tractor Supply machines. You will not be able to get parts at the local welding supply house. I turn people away for that all the time. Stick with Lincoln or Miller, or even Hobart (which is owned by Miller).
Not sure what you're looking to spend, but the Lincoln MP210 is a pretty nice unit for $999.00. It does MIG, TIG, and Stick. Dual voltage (120 or 230).
I sell a bunch of them.

The machines at Lowes and Home Depot are the real thing and we can get you parts if you go that way, but those machines are personal home units, built with plastic parts inside versus the commercial units you'll find at your local welding supply house.
Airgas has locations in Tampa and Lakeland, but there are others that sell them that may be closer to you.

Here's a link to that machine.