Jared - I think you will be better served with this course...unless you just have your heart set, from an accomplishment point of view, on having done an Ironman distance race. There is a great deal of commitment to training for a 140.6 mile race. This commitment comes in the form of time and effort for the most part because you just have to have 4,000 to 6,000 meters of swimming 3 or 4 times a week, 3 or 4 runs with one of them, at least one of them over an hour long and several hundred miles of biking a week. That is a boatload of training time. Your wife and family have to be pretty understanding of your training needs in order to make this work. The beauty of CrossFit is the speed with which you can build superior overall fitness. The beauty of the Olympic and sprint distance races is that they can be an expression of your CrossFit prowess...the long and ultra courses are not.
There are lots and lots of resources out there for triathlon training. Checkout www.slowtwitch.com
for starters and then just Google triathlon and find more. Phil Maffetone, Dave Scott, Jack Daniels, Rick Niles and Troy Jacobson are some authors you should check out. Spinervals by Troy Jacobson rock. If you have ugly winters a Computrainer and the software from www.fitcentric.com
will do wonders for your cycling. True makes great treadmills. Polar is your best bet for heart rate monitors. For running check out www.posetech.com
and Total Immersion is the way to go for swimming.