I have the HF Titanium Unlimited 200 and have been using the MIG to weld up the roof of my truck.
I've only welded with it 3 times (one with flux twice with gas) gas makes it so much easier to weld the thin sheet metal. I made my patch panel using 18GA.
Chris
1985 Ford F250 XLT SuperCab
ZF5-42 swapped 460 hot fuel, factory AC.
Part way through 4WD swap.
1988 Suzuki Samurai -- Daily Driver
1968 Dodge Dart -- Project car
1957 Chevy 4400 Flat Bed -- Collector Project
1955 Buick Century -- Collector Cruiser
Sir, from what you have stated a Flux Core welder will do more than what you require. I would investigate what the good folks at Harbor Freight have to offer. They have a few flux core welders that are in your price range. I am on another forum and several individuals have had great success with their welders. Flux core has one advantage. You can use it outside and the wind will not bother you. With MIG, it can be difficult. This website contains really useful information about the best inexpensive welders.