750 point Tyranid starter List

[Dreadnought]

The local Gamesworkshop Store hosts some kind of a bracket over a couple of months with various army points... starting at 750 and going up to ~1500. I'm trying to put together a list for my first shot at this. The list is as follows:

HQ
Tervigon - Toxin Sacs, Catalyst

Elites
Hive Guard x2

Troops
Hormagaunts x15 - Adrenal Glands, Toxin Sacs

Genestealers x 12

Tyranid Warriors x 4 - Deathspitters

My biggest concern is I don't have anything to stop lots of incoming fire from chewing through the gaunts and genestealers. I don't know if I should drop the hormagaunts from the list entirely and beef up the genestealers and maybe add some gargoyles or something for extra range. I've also never played a full game - about the extent of my knowledge is from the tutorial the store owner did with me and random bits of info i've read around the forums. Any C&C would be great. Thanks!

[Tynskel]

hmmm...
the way your list looks is that your units are screening. So they are supposed to get shot.

I think scrapping the upgrades on the hormogaunts will free some points up.
Possibly give furious charge to something else? This will give them better armor/hv inf. killing in CC.