Like I said in my other reply, it sounds like you really need the help of a travel professional--not an on-line agency--a brick and mortar agency where you can sit down face to face with someone that can present you with all your options. My choice would be Princess but that dosen't mean I think Princess is better than RCL; it just means Princess has what I like and I think it's a good value for my cruise dollar. Others feel the same way about RCL. You need to do some comparison shopping.
Like LisaP says, enjoy your planning! It's half the fun.