I'm 6"2, 185lbs, and would like to go with a shortboard, (coming from an 8' funboard)
The vibe I get from alot of people in my area (Del Mar, CA) is the CI Flyer II, but also to look into a Hybrid fish, like the Rusty Piranah, and again, I have NO idea what rule of thumb I should use for the length of these boards - and the shorter the better, I have a very, very small car

So what are the comparisons? Would it be 100x easier to catch waves in the Rusty board, but only be limitied to smaller waves, and when it's bigger (5ft+ ) what would be the major downsides to having a fish as my ONLY board?
I apologize for so many questions, I've been to about 5 boardshops in my area and noone has been very knowledgable, and it seems this is the only large surfing forum on the net. Thanks guys!