You didn't mention Kapitan Khlebnikov (the big Russian icebreaker). Quark charter it and supply their own tour crew and kitchen staff. Its a rough ride in the Drake - make sure the chair in your room is tied down as it may fall into your bunk. Food is 1st class (once you are comfortable eating it).
This year (2010/11) will be the KKs last in the Antarctic. Worth it if you can make it. Their email access was about $1 / kb. They stressed that you should not sent images or attachments due to cost. No internet.