I've owned the boc 200c and 250c both really smooth with very good wire feed about the lincoln there are mix reviews the US spec units are very good I owned one of their's small welders lincoln powermig 180c wich was excellent
I would consider the Tweco arcmaster 301 ac dc rebadged Lorch on offer at the moment 2400 £ from united welding https://www.ebay.co.uk/itm/Tweco-Arcmaster-301-AC-DC-3-phase-300amp-Ac-dc/174387698733
The Lorch unint is 1800£ good alternative to the EWM never used Lorch but I never seen negative reviews about them the opposite do little bid of research
Lincoln ac dc tigs are ok but over priced imo they current unit are quite old model and only 200 amp on single phase Miller dynasty much better you can get 280 amp on sinle phase but around 4k if I was looking for ac dc tig I would stick to good European brands Ewm , lorch , kemppi all...
Hi there is a good deal on LORCH HANDY TIG 200 AC DC CONTROL PRO for 1800 £ on this site http://www.waspsupplies.com/lorch-handy-tig-200-acdc-tig-package-control-pro-offer-8430-p.asp
If you looking for good second hand welder there is a good thermal arc arcmaster with water cooler on ebay at the moment much better IMO http://www.ebay.co.uk/itm/Inverter-tig-arc-welder-ac-dc-thermal-arc-300-arcmaster-/262962150582?hash=item3d39c3fcb6:g:OJ8AAOSw42dZB2i~