asterisk users - Feb 2008 - OT: Recommendation for EDGE/3GPP SIP phone?

I'm looking to ditch my GSM phone with Cingular and provide my own 
calling services with Asterisk hanging my phone off the Edge or 3GPP 
network...  Luckily, I have the option (through my employer) of getting 
a data-only plan.

My question is, other than the Nokia E61i or E70, what phones will do 
SIP-over-EDGE or SIP-over-3GPP?  The iPhone doesn't yet have a SIP 
client, and it's EDGE-only.

There are probably knowledgeable folks out there that have tested/used 
such devices.

Bonus points for one that's WIFI capable (I don't think my data plan is 
"all you can eat", and Cingular coverage is far from complete).

Thanks,

-Philip