Like Shocker has said, that forum is great, I used it when doing my research and I have just shelled out on a mig - in the end went for the Portamig 180 as will go up to 6mm steel as well as down to 15 amps for body work, and it will run on the household ring main
Got all the good stuff - euro tourch, and will take 15kg reels etc
Never welded in my life, and its great - have a look at some of the stuff I have been making.
When I did all my research, I found the same thing - spend as much as you can to get the best you can, as if you spend £300.00 say on a clarke, then you find its not good, you need to spend £600 odd on a better one plus the £300.00 you have spent.
I was going to get a clarke, but then the more I researched the more I was found that yes they are ok, but not 'good' if you catch my drift. I got my whole setup including a 1/2 size bottle (plus the deposit), regulator helmet etc for £700.00 - stonking deal really - had to run away from the guy before he realised how well I did
So see what you want it for, and then go from there - but now I have got mine, I have found so many uses for it, not only for fixing the Disco - sills etc, but light guards, expedition racks - even the old Chimenea steel stand has been brought back to life! You will be amazed what you can make - and what you can set on fire - including yourself
If you can, try and test out the welder before you buy it, as then you know how it works, and what it is like before you buy. Any proper welding outfit will let you do this.
Happy hunting