I'm a little late to the party, but here is a website that I used early on before I knew much about welding.

http://www.mig-welding.co.uk/forum/ '

Very active and a fair amount of US people as well as UK for good advice.

I started with a 110v and quickly learned that wasn't going to cut the mustard. I am using my neighbors Miller 250MP. Great machine precise time control for great spot welds or when I can't release the trigger fast enough.

I have the smallest bottle available and I've put in a new floor and all bracing among a bunch of other spots on about 4 bottles, one of which I lost do to a leaky flow meter.