Don't bother with any welder that doesn't have a 220v plug. The duty cycle sucks on the 120v units. The only thing those little toys are good for is maybe sheet metal. They all only have a 20% duty cycle at 70% output. This means you can only weld 2 minutes in 10. (weld for 2 minutes, cool for 8) These numbers are for 20 C (about 70 F), and I see you are in Texas, you probably have more 90 F days than most. On those days you will be down to 5-10%. I was welding out my shed floor 2 summers ago with a Miller 185, well under the 100% rating for that unit, and I was tripping the thermal switch several times an hour (30-35 C ambient). Make sure you have a gas valve on the unit. If you do go for a little unit, remember most of the flux core wires aren't the best for multiple passes. In the real world you MAY be able to weld 3\16, but only a couple inches at a time. Those small welders have cheaper electronics (you get what you pay for...) and if you insist on running it flat out, the sucker will probably cook itself right after the warranty is up.
My advice is to save some money and by a real mig down the road. You should also consider a DC stick machine. There is a steeper learning curve on them, but they handle contaminated metal better. I built my own stick welder with a zena generator, and I can't say enough good about this unit! I have a welder, 6000w genset, and an air compressor on a 13hp honda motor. I have enough power to run 2 out of 3 at the same time! The zena is rated at 100% duty at max current.