RE: .284 Win / .308 Win / .300 WSM WHICH would you use for NY DEER HUNTING
I'd use the 284 or the 308 with 150's... If you want to spend money, spend it on the best scope you can afford for either above rifle that you like best, and plenty of ammo to practise with!
Do you have a pair of decent binoculars? Buy a pair of the best you can afford of them too.
DM