New at the tyranids myself, I still have to say thats a rather big HQ selection. I think you are better off with the tyrand and throw off the brood Lord and gets some more warriors for synapes and some Zoanthropes for some heavy fire power. I also have to say that the bonesword and lashwhip seem to be very unpopular, I'd rather take Scyting Talons but its still up to you.
Hope I helped
Hope I helped