[L473ncy]

I'd go with something like a Prometheus NEO Hop up and Prometheus Purple bucking.

As for barrel seems like madbull is a pretty standard upgrade barrel. But if you want the best and are willing to drop money on it (unlikely since you're starting off with a Broxa) then EdGI, Prometheus/Laylax, and PDI make awesome barrels but they're pricey and probably out of your budget. However the Madbull will do.