We use WebEx for Support, Meetings, and Webinars. 9 licenses of Meeting, 7 licenses of Support, and 1 Webinar License. $550 per month.
We don't use unattended support for security purposes. If unattended access is needed, we ask the client to provide access via RDP, VPN, or whatever other solution that want to deploy. This way we don't assume the risk for the remote access and they have complete control over when to turn it on and when to turn it off.