I have had bad experiences with Dial 7. The drivers often ask for extra money. They are all private contractors, so the price you get quotes may not be the real price. Some times I’ve gotten an old beater as well.

I usually use XYZ for basic trips: https://www.xyzcar.com/home.aspx
Cost about $60 + tips and tolls. - all Lincoln Town Car Limited Black Sedans

And Executive1 if I want to ride in style: http://executive1ny.com/
All luxury vehicles, usually a Denali or stretch of some kind about $90 all inclusive.