Thanks guys. Makes things more clearler. One more thing, I noticed that LGA to Manhattan fare is $2.25 and takes about an hour to get there using M60 and from JFK to Manhattan is $7.25 and takes an hour and a half. I may still fly out of JFK but fly into LGA for sure. So I guess it makes sense to stay in LGA for cheaper and faster transport and just go to the JFK airport on the day I fly out. Agree?
Also, is hopstop.com the best website to figure out how to get from point A to B in NY?