ac/dc tig

If you want a ac/dc tig it will be quite a fair bit . There are the chinease type cheapys on ebay , but i do not know what sort opf quality they are and spares avalibilty coulds be dubious . if you are prepared to take a gamble they could be ok . Just bare in mind that any 200 amp ac/dc like that will not be able to weld ally for long as it wont have a water cooler .
If you can stretch to 1500+ you coulkd get something like a thermal dynamics , kemppi etc . I would save your money and get a established branded welder as it will hold most of its value . Having a look i would get one for about a grand , either the thermal arc or cemont , prob the cemont they are a good quality Italian brand.

Those stahlwerk welders are actually chinese .There are quite a few on there and they are shipped to germany adn given a german name to try to imply some sort of quality . I really don't knnow what there like , i do have a similar one but ive never used it . What i do know it that it weighs a absolute ton must be 40 kgs at least so its not mobile really unless you like hernias . Also all the switchs and stuff on it seem really fragile . I really would nt know what to go for . A chinese/german one might be ok but then it might brake in 2 weeks . I wouldnt also pay any attention to stuff like that having TUV written on it . I really don't think you can get a decent ac/dc 200 amp welder for less than a grand . My opinion would be to save your pennys and get a more expensive one . It will be less inclined to break , good warrenty and spares supply . As i said it will also hold a good lump off it resale value if you need to sell it which would be the case with a cheapy . Sorry i couldnt give you a diffiinate answer.

When I was doing it for a living it was generally Miller,Lincoln or Murex.... But that was 10 years ago.

I would be waiting for an industrial tig/arc set to come up locally second hand, but thats only my opinion.

A similar thread is on Locost builders here link

If I had the cash, and could sneak it past Mrs Nozza, this is the kind of thing I'd be looking atlink

thats an interesting read, one person on there has commented that you can use a 3phase machine on single phase by rewiring the imput and upping the breaker rating

A manual.

Miller 330 A/BP manual

Check out page 22 of the pdf, Single phase 230V 96A!! 96A is quite a bit mind, and the weight, at 376kg needs to be noted!

I'm sure you already know, but don't just whack a bigger breaker in your distribution board. Check the wiring first. Have you seen the gauge of the 30 amp cable supplying your cooker?!