Good to hear that you know what you are getting into.
You will be overpowered in anything but light winds, but very fast in the light stuff.
In stronger winds you will be so overpowered that you can not get the boat up to top speed.
The good thing about it is that you dont need to go on a diet, every added cheeseburger will make you go faster. <img src="http://www.catsailor.com/forums/images/graemlins/cool.gif" alt="" />
Downwind you will have enough to handle with the main in your hand and the jib sheet+traveller eased. If you decide to hoist the spi downwind, you might consider installing a bungee to hold your rudders straight while you sheet the spi doublehanded until you have it trimmed.