Welcome to the colonies and to the forum. I'm no expert, but I think you would do better buying a used kayak rather than a new cheap one. I recently saw a post on the buy/sell section of this forum for a 13 foot Ocean Kayak Prowler for around $400. It's a fine yak that does well on the open waters. Disclaimer: I happen to own one myself. I'm sure others with far more knowledge and expertise than I will join in.
http://www.bigwatersedge.com/bwevb/s...ad.php?t=28255