go on the first one and then it will be easy for you guys to make a decision about the second one. Even if they sell out they usually have no-shows or last minute cancellations.
do it at the first for sure ... that way u have the rest of the trip to party with all the great people u met on the cruse .
We just booked for the 8th too. We are not staying in Temptation but cannot wait to get our asses on the cruise.