Unless you are going to spring for a Balcony, the only difference between an inside and an oceanview is the light coming through the window. Bring a wall plug night light or leave the bathroom light on and your money ahead. Unless you plan on spending a lot of time in you cabin, save the money. If you are the person that plans on sitting on their balcony alot, then get a Balcony. But there are more entertaining things to be doing on a cruise then sitting in your cabin.
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007, Celebrity Silhouette 2013