Antarctic Peninsula vs Ross Sea Region

Hi,

Last November I had a marvelous trip (Falklands, South Georgia, and the Peninsula) on board of the Russian Aleksey Maryshev.
This expenerience was so phantastic that I want to see more of
Antarctica.
Now I've been informed that in January and February 2008 the
Russian Ice strenghtend Marina Tsvetaeva offers 2 trips to the Ross Sea.
There are also 2 helicopters on board.

Has anybody been to both areas ?
If you compare the Peninsula with the Ross Sea region, what are the differences, what is better ?

Would you recommend to visit the Ross Sea on that ship ?
Isn't it necessary to go there on an ice-breaker like the Khlebnikov ?

Thanks

Hannes