Brad, any experience sailing catamarans? The reason I ask, and I hate to tell you this, if you have none, then it's a whole new learning curve for you. The only advantage you will have, is the ability to read the wind out on the water, I do not mean to discourage you, but the reality is that there is a huge difference in sailing a catamaran, just ask dave-r.
http://www.thebeachcats.c…ms/viewtopic/topic/14021
Please read Dave's post, and then ask yourself a few questions, the most important being, am I in good shape? Sailing a catamaran does require a certain level of fitness, you are constantly moving on a cat, one moment you are out on the wire, next you are rolling under the boom as the cat comes about, if the cat flips, can you right it, can you get back up on the tramp from the water?
http://www.thebeachcats.c…ms/viewtopic/topic/14029
As Bacho suggests above, start out with the 5.2 and get comfortable with handling a catamaran, gain experience with the nuances in sailing a cat, you can always upgrade to a larger cat later on, one with all the bells and whistles to go fast. The extreme difference in speed between a mono and a cat will satisfy your "need for speed" for quite some time on the 5.2 without the "toys", I can guarantee you........
.... JMHO