Go with Verizon or wait for AT&T GSM? The title says it all. I'm in NYC and do travel nationally for business. Need a phone and service fast, should I go with Verizon now or wait for AT&T GSM service which is expected to roll out in a few weeks? Will GSM give me better voice/call quality than CDMA? My only concern with GSM is coverage. Is my concern warrented? Thanks.