WH40K: Tyranid Genestealers-1000 pts

[punkrabbitt]

I've heard that Genestealers pretty much crush everything in their way, so I am interested in some feedback on a mostly-Genestealer list:

HQ
1 Broodlord: Catalyst
1 Broodlord: Catalyst

Troops
17 Purestrain Genestealers
17 Purestrain Genestealers
17 Purestrain Genestealers

Fast Attack
10 Gargoyles

996 points-68PL

Would it be better to go with two units of 20 Genestealers and one unit of 11. or keep them at 17 each as I have them here?

The Gargoyles are meant for harassment and objective-seizing.

Criticism and comments welcomed.