Huawei e585
I have a Huawei e585. It is "3" branded buth Zibri unlocked it for me (via the Internet) for $5. I works quite alright as long as the cell site isn't too congested. The limit of 5 devices is quite a bother some times when people have ipods, ipads and laptops. It is very easy to reach that limit.
If you need a very portable solution I can recommend the Huawei MiFi routers, they can also work as a dongle with a micro usb cable. At home I use an Asus router which has a USB port which works with a 3g modem. That solution doesn't have the same limitation as the MiFi routers but it requires an electrical hookup.