sounds about right if you are on carve gybes, it depends what you want to do, freestyle, freeride, wave, speed or slalom?
freestyle boards tend to be from 80-110 litres
freeride tend to be 90-150 litres
wave tend to be 60-90 litres
speed boards ( i'm not sure) but from what i have summised are 40-90 litres
slalom boards (as above) from 60-100 litres
some big generalisations there,
the smaller the borad the more manouverable it can be so tricks and turns are easier
smaller boards can not use larger sails, so my 79l board is recommended up to a 5.3m sail. there are exceptions to everything i have said.
wish i was in the red sea, no wetsuit, just boardies and a harness... enough of my daydreaming
from what i know the screamer is a freeride board, so fairly versatile, good for some speed and carve gybes, chop hopping and maybe a bit of looping too, what do you want to get into?
here are some video links to help you make your mind up:
First is freestyle, bit of Andy Chambers for you, top bloke, met him in greece.
http://www.youtube.com/watch?v=8j8c6p5YcY8second is wave, for this a bit of levi siver, never met him but would like to
http://www.youtube.com/watch?v=W2-uOtOEtMIthird is slalom, just some PWA footage, would love to race but i'm only 10stone
http://www.youtube.com/watch?v=VtBGkW4KILEfourth is speed, crazy people, who go really fast, and then crash, and break stuff
http://www.youtube.com/watch?v=OcyifOVKP8wfreeride is a good progression stage but if you can allready water start then if you want you could moove onto one of the other disciplines, tho you don't have to, a lot of people stick with the freeride, and it is a lot of fun and allows you to sail in arguably the widest range of wind conditions.
I'm openly biased towards the wave and freestyle side of things.