Originally Posted by Mark IV

As mentioned already, nearly any one of several modern,popular brands (including Hornady) will suffice just fine.
The critical thing is that it cycles properly in your weapon, and there's only one way to determine that (and it ain't by asking strangers on the internet ).
These days, Federal's HST's are pretty widely considered the best-of-the-very-best, but the top-of-the-line stuff from Winchester,Hornady,Remington,Speer, and others, are very reliable and solid performers.
Personally, I'd go with whichever one was most readily available to you, and that you could most easily afford to shoot a box or two of, and then put a few boxes away. Hornady and Remignton Golder Sabres often seem to be more economical than the others, but the HST's can sometimes be found reasonably.