This second one I did, the "Drop-Fex", possesses two pairs of Scything Talons for max re-rolls, and leaving off the Crushing Claws allows me to take advantage of his Initiative bumps if he can get an assault off. I'll also be kitting him out with Bio-Plasma so he can do something when he lands (if he can resist his Instinctive Behavior), and Frag Spines so when he moves through cover he can still enjoy those Initiative bumps when he reaches close combat.
Have I mentioned how much I like this model?
Later this week I will show off my Mycetic Spore model solution, as GW makes no official version for the 'Nids.
--Scott