I want my 7520 to function under the logic of a phone first and email second.
I think you summed up the problem right there. The 7520 is an e-mail device first. It may not be the right tool for you. The 7100 series (I know Nextel doesn't offer it yet) is a phone first and an e-mail device second. But the other BlackBerrys, including the 7520 are designed to be e-mail devices.