Going Fishing

Hi guys. Right I could really use the wisdom of all you experianced surfers on this forum and would very much appreciate it if you could help me out.
The last couple of days have seen some fun little waves on the north coast. However i havent really had much of a good time in the water because my short board takes the "fun" out of "fun little waves". Predomenantly the people in the water are either riding mini mals or longboards. I'm looking to purchase a board for days such as these but i am reluctant to buying a large surfboard mainly because they are a nuscense to travel with.
The surf shops reccomend me to buy a Fish as apparently they are designed to catch waves easier. Which is ideal because they are portable and great looking surfboards. Before i commit myself to buying one though i need to make sure that i buy one suitable for me. From what i saw there are so many variations of these boards and its quite daunting having to chose between them all.
So what do i go for? I am used to surfing a 6'4"x 19 epoxy shortboard so can i afford to downsize to as low as 6'? Also, as far as performance is concerned would i benefit more from a twin fin or tri fin or "keel fin" (whatever the hell that is) Some of the boards that i looked at also have jagged rails by the tail. Whats that all about?
Life would be so much easier if the surfshops would let me test all of their boards so i can chose one i like based on how i get along with it. Unfortunately none of them are willing to let me. Bastards!
Thanks in advance for your help guys
The last couple of days have seen some fun little waves on the north coast. However i havent really had much of a good time in the water because my short board takes the "fun" out of "fun little waves". Predomenantly the people in the water are either riding mini mals or longboards. I'm looking to purchase a board for days such as these but i am reluctant to buying a large surfboard mainly because they are a nuscense to travel with.
The surf shops reccomend me to buy a Fish as apparently they are designed to catch waves easier. Which is ideal because they are portable and great looking surfboards. Before i commit myself to buying one though i need to make sure that i buy one suitable for me. From what i saw there are so many variations of these boards and its quite daunting having to chose between them all.
So what do i go for? I am used to surfing a 6'4"x 19 epoxy shortboard so can i afford to downsize to as low as 6'? Also, as far as performance is concerned would i benefit more from a twin fin or tri fin or "keel fin" (whatever the hell that is) Some of the boards that i looked at also have jagged rails by the tail. Whats that all about?
Life would be so much easier if the surfshops would let me test all of their boards so i can chose one i like based on how i get along with it. Unfortunately none of them are willing to let me. Bastards!
Thanks in advance for your help guys