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Almost any mid-range TIG set-up with a standard torch will get you what you need. One of the biggest differences is the duty cycle - or what % of the time the machine can be run. For most custom fabrication it's not an issue. You are clamping, fitting, tacking, then welding. In a production environment where everything is always the same, and ready to weld immediately, you need a high duty cycle.
For TIG, a mid-range set-up isn't going to hold you back. It's more about developing the skill than it is about the tool. Getting some good hands-on instruction would be much more beneficial than having the best equipment and not knowing how to use it.
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