[superceded 'cause I forgot to add the footnote]

Peter Pan said:

Thanks for all the info, I've been doing some reading and correct me if I am
wrong, but this is basically a weed that comes back every year unless you
treat for it.

Yes, it's a perennial.

If I put down a pre emergent in the spring for crab grass, will this prevent
it from coming back

No. The pre-emergent stops seed germination. The nutsedge, while it
produces seed if left to mature, will return from small tubers at the ends
of the rhyzomes.

or do i need a specific product? The Sedgehammer is
unavailable in NJ where I'm from (according to their web site). What other
product will work like the sedgehammer?

Sedgehammer is available in all 50 states, last I knew. You must have read
something wrong. There's a website dedicated to nutsedge, that also sells
Manage (Sedgehammer). You could order it from there [1]. Keep in mind that
it does take several applications. Nutsedge is one of the most difficult
weeds to control. As trader said, it's probably best to go ahead and seed
as you planned, then deal with the sedge next summer.

[1] http://www.nutsedge.com/index.html
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Eggs

Do cemetery workers prefer the graveyard shift?