If you've unlocked Whirlwind in the DW tree, I'd definitely recommend picking it up and, when available, morphing it to Steel Tornado. That'll give you a great AoE option for your bar, which currently seems to be strictly single-target.

Shadow Cloak is nice for PvP or for getting out of sticky situations. I know you said no Siphoning skills, but it might be worth it to slot something from that tree while you're leveling so that you at least have the option to spec into it or try out one of the skills later. Drain Power, which you don't unlock until Siphoning rank 42, actually has a stamina morph, Power Extraction, that you might want to try out at some point in your build. Personally, I make sure to have at least one skill from each tree on my bar while questing and leveling to ensure all the trees level up fairly equally. As much as I despise Funnel Health (Strife morph, Swallow Soul is other morph option but not impressed with that either) and its mediocre healing, I've had it on my bar since I unlocked it to level up the Siphoning tree.

Other than that, you seem pretty set. Keep leveling up your skills, unlocking morphs, and enjoying the game. Don't worry about really sticking to any one build until you've reached some endgame content. For now, experiment away.