These folks are a dealer for launch here http://www.woodford-diagnostics.com/
600eu wont go too far unfortunately in the diagnostic end of things.
The only thing within your price range thats worth having IMHO is VCDS (vag-com), genuine, would set you back about 300, and its also pretty good on EOBD vehicles and can create data logs.
If your serious about business, I think you'd be best advised to buy from a reputable outfit here or uk and at least have a warranty and updates available.
For an all round tool I think the launch is probably the best, it has good coverage of european and jap, which I find puts it above the snappy or bosch, its also is cheaper. Its not wonderful on ford, lacking in activations, but I've had it on a denso tdci transit today with an egr/maf fault and earlier this week coded 2 new delphi injectors on another so it can still deal with most problems.
No single machine will cater for all your needs and you will have to identify what makes you are seeing most of as you go along and see if its going to add up buying other tools to cater for specific areas.
What scanners have you used/ have access to up until now?