Re: MIG welder options??
I have one of those Lincoln SP135+ units also. I use it to weld mainly stainless. I prefer the solid/gas vs the flux core. Like mentioned earlier, flux core tends to spatter more and makes more for clean up. I can't have spatter on the stainless I weld. On the highly polished stuff, I wet towels and lay them in the areas I'm protecting. With the right gas pressure, there is no spatter hardly at all.
I'm happy with the Lincoln I have. It was completely submerged in the flood. Took it all apart and put everthing in a convection oven. Cleaned, lubed, and put back together. I think it welds better than before the flood.
I have used flux core and still have several spools that are about 5 years old. Just don't care for it,,,,,maybe cause I'm old school, but that is my preference. While your at it,,,,,GET A PLASMA CUTTER,,,,,,,,almost the best invention since the woman,,,,,,,almost

Good Luck LT!,,,,,,,,,,,,SS