Spot Welder?

I use my old school 220v Miller on a regular basis. You used to be able to find them on ebay for next to nothing but not anymore. Had to break out the big 18" tongs the other day to do some inner fenders.
Im thinking about getting a harbor freight one because the miller is so damn heavy. It will literally leave you winded after a half dozen spot welds. I will have to weigh it and see if the HF one is lighter. HF lists theirs at 29 lbs so its not a lightweight either.
I also have a Lenco spot welder like this one linked below. I use it mostly for specialized places like drip rails and places you cant use a traditional spot welder. The dent pulling attachment for it is awesome.
Lenco Spot