Awe c'mon guys.. you don't have to be soooo disparaging soo early on.
Ok, So I've got two SUP's. I've been SUP'ing for 4 years now and I really love it. I get the best of both worlds in the surfing department, 1) I can paddle back up wind with ease and 2)catch more waves.
So, I'd recommend you get a 12ft'er with about 35" width for flat water and if you are into waves get a 10'6 with about 33" width. Obviously there are differences in hull shape depending on dicipline, the longer and wider the board the more flat water related, shorter and (sometimes) thinner with a bit of rocker for surf.
I've used my 12'er in waves and it's been excellent for catching 1ft through 4 ft waves, it's a bit big for sharp turns but then it's more of a cruising plat board so that'll explain that then. The 10'6 is used in more waves 1-8ft but getting into a 8ft'er can mean going gungho and is not recommended for novices, anything under 4ft's a giggle though.
There are lots of models around, depending on your budget and brand ideals. Starboard make one of the most comprehensive ranges and windsurf/surf shops will stock them so you can look and feel them. Robin Hood Watersports is a huge warehouse that stocks them and has a mahooosive online presence.
There are many manufacturers these days, lighter materials and better manufacture proceses mean cheaper models and if you are looking at the lower end with out compromising too much then there are some great boards for C£400 and range well upto C£1500, all depending on your budget.
It's a laugh a minuite SUP'ing. Huge following, hope these links help you.
SUP UK Forum
Robin Hood Watersports
2XS (local to me watersports shop)