okay. Personally there is no such think as 'a beginners board'.
You can get an excellent kiteboard that lasts you from your beginning stages right through until you are throwing nice mobes and k'loops.
My advice is to DEMO one... actually TRY the board you are wanting to buy. Any reputable dealer will have, or be bale to get you a board to try before you actually purchase it.
I know Padi has an enormous range of kiteboards, wakeboards, and kites if you are interested in trying the gear before you buy! At least you won't waste your money!
I unfortunately made the mistake of solely listening to the shop where I purchased my first kite, board and harness, and ended up with a 140 board. Personally GREAT for learning, but honestly, after that just oooo massive.
Give it all a shot. At least you know if you can try it, you're getting an honest opinion off all the gear, and a feel for it yourself.