I am sorry, but I believe it is a risky buy. There is plenty of room, and there are plenty of houses in the market, in East Meadow, that you don't need to have Uniondale or Roosevelt within a stone's throw of your house. That fact alone would (to me, at least) drop the value of the house by at least 100K.
If you can afford a 575K home, buy in Barnum Woods or the eastern section of East Meadow.
As they say, the top 3 rules in real estate are LOCATION, LOCATION, LOCATION.