Thanks Jihadin, just looking to find my feet and get some advise about the Nids.
I was drawn back into
40K after a brief episode as a kid, it was a niggling feeling I was getting all the time, that I needed something to do that didn't involve a playstation, everytime I passed a
GW I was like, 'I wouldn't mind getting back into all that again' I finally took the plunge with Dark Vengeance and now all is calm

.
I decided that I wanted to build a Tyranid army, simply because they look awesome, word is they're weak but I'm mostly in it for the painting and collecting so I can live with that, I guess learning some good strategy and unit choice would make for a good game.
Sorry for the life story :p, but it's where im at.