the only upgrade I would do is like I did on mine and thats change out the sights, other than that spend money on ammo and practice with it... I love my G30SF and its my EDC weapon, have around 1000-1500 rounds thru it and functions great..
Heres some mods i did to my g30 to give you an idea...
Clip draw, 3 piece chrome kit, extended slide and mag release, extended take down lever, laser/light, extended mags, ss guide rod, polished barrel, 25cent trigger job...next mods are gonna be the trigger and nite sights.
As for hunting, i knew a guy who hunted hogs and boars with a glock 21 so a g30 should do it.