I can't recommend dimensions for you, but then again, that is what the shaper's job is. I have surfed that board in ankle slappers all the way up to well overhead. It seems to work great until we get those rare days when the surf is significantly overhead.
The only times I felt that this board wasn't cutting it was during Irene on the second and third days of the swell when the surf was double overhead. Gets way too squirly. But in solid 2-3 feet overhead and down, this board performs like a champ. fast as hell and really holds in hollow conditions, and works awesome in the mushy slop we get all the time. the board turns on a dime too.
there is a reason a lot of folks are riding those quad fish, they are super versitile. I love this board. my 2 cents. Oh, one more thing, i paid 500 bucks for mine, but i needed a pretty big board (7-6x21.75x3.25) due to my size 6-6 260. you could probably get away with someting smaller and thus cheaper.
you guys are right...thanks...went to a local shaper, im getting a 6'-10" 2 7/8" 21" with progressive rails, hybrid fish/swallow tail, for 450.00, very surprised and very happy with the outcome....in 2 weeks a brand new stick