I'd buy old American. Weaver, Walker, etc. and rebuild it. Last as long as you want.
+100!
Where do you get seals/parts ?
I had a 1980 snapon 6 ton I bought of craigs list for $75 with a bad seal. Broke it down and sent the jack to guy who rebuilt it for another $75, he does them all, hein, walker, lincoln, SO and the likes. I can dig up the info if you want. He also sells rebuild kits for them for under $20 shipped IIRC