You did get a great deal on your inside cabins! At least you will have some room to yourselves. We have sailed our last four cruises in balcony cabins (they're really terrific) but due to the economy we had to cut back a little on expenses in order to cruise and our next two (one 4 dayer on the Sovereign in Dec. and a 7 dayer on the Grandeur next April) we are taking standard outside cabins.
We got the Sovereign for 261pp and the Grandeur at 577pp. I will miss my balcony, but I need to cruise!!! and.. the price was right!
Have fun on your cruise and enjoy the extra money you saved. Maybe put it towards another cruise?