Thanks for all of the comments and suggestions. Y'all talked me into going name-brand, though knock-off's are about 3/4 the price and have more widgets. But being a newbie in the worst way, I don't have enough knowledge and experience to necessarily notice a bad fitting or dangerous connection or piece.

So here's what I got: Victor 0384-2544 Medalist G250AF-540/510LP Cutting System

I'm springing for a 25 ft Grade T hose to replace the 12 footer. 50 ft sounds like a tangled mess and 12 ft sounds like a hassle.

Thanks again for your help!