Not Cheezz but lots of experience in cruising....
Royal Caribbean is a great combination of price, entertainment, food and accomodations. We actually prefer the mid-sized ships over the mega-ships though they are still nice.
Celebrity is the upscale Royal Caribbean line and the food is slightly better but entertainment is not quite as good.
Princess and Holland America are both up in the same class as the Royal Caribbean and Celebrity.
We had a bad experience on Norwegian but it was an older boat that was not built to be a cruise ship and it showed. I have heard much better reviews since they started building new boats but haven't cared to give them another shot.
Whatever you do, don't short yourself and take Carnival - most people (especially old farts like me) do not take well to them and it's almost enough to make you swear you'll never do a cruise again.
Depends on where you want to go and what is important to you. If you want more information, PM me - I have some other information I can give you.