I disagree with Ogloo. Pick what is fun! Follow his recommendations if you are planning to run instances at level or do heroics. It's rather difficult to get your pets to stay alive and hold aggro in the tougher instances, so I wouldn't run out the door thinking you have it all covered. They will do fine outside instances.
Fun is important, party makeup should be what would be fun for you. I do HIGHLY recommend having a paladin tank and/or at least one shaman for their ability to tank/dps or heal/dps and wipe recovery.

Fun keeps you playing.