It depends on what you want to do really. Do you intend to take it out with you to do landscape type shots? Do you want to travel with it? Is it only going to be used in a studio? How much weight will it need to hold (bearing in mind what equipment you plan on getting in the future)? All that needs to be considered before you can make an informed choice as to what is best for you.
For me I wanted to be able to take mine out walking / hiking and be able to pack it in a suitcase when I go away, so I opted for the manfrotto 190 XPROB (smaller / lighter than the 055) with 486RC2 head, so far I have been very happy with it.