Question about Hi Fi Tri

Hey Ya'll,

I am new to this and I was hoping someone could help me with a wet suit question. I will be doing the sprint tri in October and I noticed it said on the site the avg water temp is 74 degrees. Would I be smart to do this in a wetsuit or with it being a sprint would it be a waste of time. Also if i was going to buy a wet suit is it better to get one with sleeves or without. Any help will be appreciated.

Thanks,
James