My opinion is that I would say stick to a Tri fin for now until you feel confident going down line and are able to make bottom and top turns. The quad is a lot faster and may be too much for you if you are just starting to going down line. I went from a 6'2 piranha tri fin last year to a 5'10 quad this year and there is a pretty good difference which depending on how good you feel you are, i would wait and get more comfortable until you feel yourself that you are ready to go to a quad. I mean don't get me wrong if you feel you are ready now by all means go ahead, but like the guy above me said, if u can find a good board with a 5 fin box setup, you could always try it out so its not like you have to buy another board you can change whenever u want. I think that would be your best bet.