While it is possible to do some very creative trees, keep in mind that splitting a single calling between ranged and melee will result in a weaker (reduced dps) of either spectrum. You're better off building one calling into a pure ranged dps and one into a pure melee to increase dps.
However if you're looking to be a jack-of-all-trades but master of none that's cool too.
i'd add saboteur as your 3rd-i'd lean towards the sab for the 5% dex teir 1, plus the snare bomb can come in handy. of course if you're **** bent on survivability than go bard, the bonus to your health is right at the first tier.