Use the Earthlink account I keep for use in the rare instances I need a dial-up account on travel. Advantages: webmail, poppable; disadvantages: I probably won't pop it--I don't think it's securely poppable or imappable; I might decide that it doesn't make sense to keep paying the expense and cancel it.
Use the Yahoo account: webmail, not tied to a for-pay ISP, decent adaptive spam filtering; disadvantages--attachment size limits, I might have to pay if my mail volume increases much
Use the cable modem account-associated account: advantages similar to Earthlink; disadvantages: might have to ditch it if I move...
Thoughts, dear friends?