Welder: How is a Lincoln Weld Pak 100 HD?

You'll ultimately be happier with a 140 or 160 amp unit that has a gas regulator. Go talk to your local welding supply house. You might be surprised what sort of package deal they can make you. They'll beat the local home center's price and be much more helpful in the future. Heck they may even have a reconditioned or trade in unit they'll make a deal on.

For the record, I've never wished my 180 amp Hobart was smaller.