I finally found someonte that got the settings working for Cellular One, formerly Chinook Wireless, so I'll post them here just in case

MMSC: http://mms.cellonenation.net/mms/
Proxy: 204.181.155.195:8080
APN: wapgw.chinookwireless.net
Username: (leave empty)
Password: (leave empty)

I'm on a Pevey SIM, so I think that's having an effect on sending and recieving. So far it's sporatic and I have to reboot my phone after sending anything. I'll update this if it changes after the 3G unlock comes out.