I personally wouldn’t spend the money on a multi-function constant-voltage/constant-current (TIG-MIG combo) machine. In my experience as a tool/machine/system becomes more complicated it introduces the potential for more problems. To fit all of the functions into one machine at a reasonable price point, the manufacturer usually has to cut corners or cut out functionality that would be considered normal on a dedicated machine.
A few things to think about:
A TIG/MIG combo will require two tanks of gas ($$$). MIG hoses are usually short and require you to bring the machine to your work (moving the machine around the shop). When you TIG weld you usually bring your torch to your work (leaving the machine stationary). The cooling fans on these machines are usually strong enough to disrupt the shielding gas while TIG welding so keeping the machine as far away as possible is best. Do you have an extension cord heavy duty enough to move a machine around the shop ($$$)? Is your welding cart strong/big enough to hold both gas tanks, machine and cables that a combo machine requires?
DC TIG welding is quiet and clean and requires a draft free work area. MIG welding is smokey, dirty, and a much greater fire hazard (MIG splatter is a bastard). How does this fit into your shop layout?
Do you think you might want to TIG weld aluminum? That’s not going to happen with a budget TIG-MIG combo machine.
A dedicated multi-voltage (110-220v) AC/DC TIG setup would let you do all the TIG you ever wanted -PLUS- you can arc/stick weld with this same setup. Arc/stick welding in my opinion is far more versatile than a MIG setup for repair/fab work, but I’m speaking as a son of a welding instructor so YMMV.
I have a Prime Weld TIG 225X in my home shop. For the price, features, and accessories you get, I think it’s a great machine. It’s DC TIG characteristics are on par with every other inverter on the market (DC TIG is hard to screw up in a machine). AC TIG on the Prime Weld is acceptable (AC is much harder to get right in a machine).
My main welder at the fab. shop (work) is Miller Dynasty 280DX, but that’s probably not practical for you right now. “It’s so choice. If you have the means, I highly recommend picking one up.” 
Back in the day I purchase and quickly sold an Everlast machine (model number is irrelevant). Read into that what you will.
If you know you want/need to MIG, I would get a dedicated Lincoln 220v machine. Stay away from the 110v flux core machines regardless of the manufacturer.
ESAB makes a good machine, but I question the swiss-army knife approach to welding processes.
Hope this helps.