Right this is my area! :D
I'm assuming your in the UK...
www.atbmag.co.uk - wicked UK ATB publication
Info and a shop -
http://www.atbsports.co.uk
Shops
www.atbshop.com
loads of others surch for them.. doesn't take much prices between the same boards accross the shops doesn't really vairy..
Centres - List all the main ride centres accross the uk...
www.maxtrack.com
www.ridethehill.co.uk
Ok.. as for the board... I'll say one main thing:
*****
Don't get a board with Monster Trucks...
Channel Trucks all the way, they spring back supurbly for sharp turning, stability at speed and they take a hell of a bashing. Also easyer to grind on.
*****
Other thingsd to look for is the build, flex and the straps.
Stear clear of "exit" boards
MBS have done me proud over the past year excelent build and felx in the boards and are built with the option to add a break at a later date, but you dont need one, just master the powerslide stop and your sorted, it easy.
noSnow boards are for the snowboarder really, mainly cause of the flex and the straps (your bound in) personally I don't like them, very sloppy ride
Scrub - I havn't tried the new range yet but the old one I found to be quite stocky and unresponsive or the other extreme of uncontrolable!
quite a few other up and comming board makers but thats the main ones.