I just ordered a case of the 124gr FMJ's from MG's. It should last me a month or two. I'll have to try MannyUSA the next time I order.
My recipe is very similar to yours for my SA XDm.
124gr MG or Zero
4.8gr WST 1.155 - 1.160 OAL
WSP in a used Federal or Winchester case.
Brass is the easiest for me to pickup. The indoor range I shoot at lets me snag a jarful of brass every time I shoot. So I'm over 10,000 loose cases after only a year shooting. I just sort it, and pick out the Federal and Winchester since there is so much of it. I really prefer the Federal. Average weight is a little higher than the Winchester, so my assumption is that it is a little thicker. And for whatever reason it cleans better in the tumbler.
On powder I love the WST. Very clean, very accurate, easy to drop powder. It smells good while reloading, and it even smells good(kind of sweet/cinnamonie) when it's fired. It's a very nice powder, and more than a few people at the range have commented. Either they say "Mmmm, WST eh?" or just a generic "What is that you're firing, it smells good..."