Well I read on some aero data (i can try to find it later if you want) that putting on a $200 aero helmet gives four times the aero advantage as adding a pair of $2000 zipp wheels... let alone the eastons.

Buy a helmet and save your money wait until you have already bought a wetsuit, a Tri bike, racing flats, a trisuit, etc.

Also, TT wheels are not as good for climbing, which in tri's usually is not a problem, but since you are still new, you might want to do a few bike races too.