I just watched the video and can't help commenting, that doesn't look safe at all to me. What kind of prop do you have on there?
If the prop breaks you'll end up in the water with a heavy weight on your back...
(You might also risk future flights if you don't replace that prop)

Have you tried kite-surfing? A lot more challenging and fun!

Back on topic, a few companies do offer kits in both ARF and true "kit" form. Problem is that with the current working conditions they have in the east then the prices are very similar...