MacBook Air :: Anyone Use A 3G Phone With MBA?

I have an AT&T Express 3G card I use to use with my MBP (which I sold yesterday). I am picking up a MacBook Air today during my lunchbreak . Since the MBA does not have an express slot, I have the following options for high speed internet on the go:

1. Get a USB 3G Modem or get a USB adapter for my current express card. The only problem is it would stick out and take up the only USB port on the MBA.

2. Get a 3G phone capable of sharing the connection over bluetooth. It would look seemless, but I would have to make sure the phone is charged. I currently use an iPhone as my main phone.

I take a train ride everyday to and from work, so I've gotten used to (spoiled?) having high speed internet. If I go with option 2, I would probably get a phone that is not that feature packed, I just want a stable and reliable connection, as thats all I would be using it for.