Congrats on the purchase, I don't think you'll be disappointed.
I hope this helps you: Though they didn't group worth a damn in my barrel when it was new, I do plan on revisiting the powerbelts, for the sheer fact that they load so easy. So that seems like a good choice if they shoot well for you (duh!) For me though the T/C 240/245? XTP's shoot hands down the best. When I do my part they shoot .75" groups, when I don't, 1"(or worse). They are cheap as hell and can be found almost anywhere (Wally's or Dick's). The only down side like I said was they load a bit harder than the powerbelts.
As far as powder goes, i don't use pellets, I tried them but I like the versatility of loose and besides that, I 'm just too cheap (or i shoot too much, whichever way you want to look at it)
I also see no time advantage using pellets over powder (which many people have claimed to me) With speed loaders charged in my pouch there is absolutely no way I'm at any time disadvantage. I switched to FFF t7 by accident this year and It has given me a marked accuracy improvement.
That's what works for me, It might not work for you but then again the whole fun of this (to me anyway) is getting to spend time shoot'n and tinker'n. So don't be in a rush to figure the thing out (except for deer season) cause believe me their is no emptier feeling than having no loads to work up or guns to work on!! This will only lead to typing long rambling passages about guns to strangers on-line. :wink: