If you want to run raids fairly soon, id pick sunsinger since its a good pick for nightfalls and raids, if you pvp, you should pick voidwalker. Go sunsinger first if you want to pve first, voidwalker if you pve first Heart of praxic fire is very good, for both pve, and pvp, believe it or not, sunbreakers are also very good for using solar flare grenades, using them for zone denial is good. Light beyond nemesis, apotheosis veil and starfire are okay, but not essential.