Id pay $20+ for just Ghost Ship Raid.
The final Raid map was the entire boat that you had to get through, different paths etc.
one of the coolest and most fun things ever.
http://www.youtube.com/watch?v=4WI6AoxonsM&feature=relmfu
I never got to finish that map. It was pretty confusing and I remember people dying a lot every time I played it.