As there seems to be more than 8 people interested in having a clan VOIP, Vent would not be a viable option as it limits connectivity to 8 clients.
Skype seems to be the one in second place with 3 votes. I'll post up the Skype Names of those that are interested in participating in Skype Voip here in this sticky.
FreakyFranky: warhog76
Headstrong: nicholas.hubbard2