I've got a fair amount of welding equipment.
A proper spot welder for panels- it's the bee's knees and produces great welds that look original. But, if I wasn't doing extensive panel replacement it wouldn't be justified.
I got a mid-power MIG set up and used it a bit... but found that all the apatter was a major annoyance- my eyesight is poor and getting too close to the welding was not good.
I then got a oxy/ace gas and found that really useful, much easier to use. This is particularly good for non-welding heating tasks, like freeing rusted fasteners, burning out bushings that won't otherwise move, cutting metal, etc.
But what I like best for regular welding is a inverter (DC) TIG, it's smaller than the MIG and allows much more control over the welding; and there's no spatter at all so I can clearly see what the weld is doing.
If you can afford it I think the inverter TIG is better than the MIG; and that combined with a gas set-up would be ideal....