RE: Newbie
I've been using 125 grain bh's for years, and see no reason to switch unless I get a chance at a water buffalo or something similar. Those flying meat cleavers have come about, IMO, due to the popularity of carbon arrows. Carbons are generally light and stiff, but seem to do very well with extreme FOC--a perfect match for a monster broadhead.
Generally speaking, 8-10 grains of arrow weight per pound of draw weight is fine, a bit more won't hurt. That's finished arrow weight, including the broadhead.
Btw, welcome aboard!
Chad