From the research I've done, I think the tunerstein is 1g only, along with all the other freeware stuff out there. Unless I can find somebody selling used stuff that will respond to my e-mails, I guess I'm stuck with the pocketlogger stuff.
And I don't know how to make a cable, but given instructions I'm sure my dad could whip something up. He's an elec. engineer at Cat, builds stuff like that all day.