Looking at the 250EX specifically for the spot timer function. Wondering if i can get away with a lower model and get the same or similar results (consistent attractive spot welds).

The 250EX is about double my budget (and would still need to buy an air cooled torch), but the $ not as important as the final outcome.

My usage is 99% non structural "sculpture" type stuff made out of 18g stainless and aluminum, plus old keys (cupronickel) and coins (copper, brass, nickel, stainless).