Ask HN: wireless Internet?

I've been itching to try a 3G wireless card for a while. When my contract with T-Mobile expires I'm finally can switch to a carrier who offers good wireless access. Sprint, Verizon and AT&G all advertise as super fast, but just like with anything else there're some losers and some winners. Which 3G service in NYC area do you guys use? How's your impressions? Also, the hardware needs to be easily compatible with Macs. Thanks. P.S. Of course I'm googling, but asking for something here always brings unexpected new perspective on just about anything.