Training question for HIM

So I just finished my first tri, a sprint distance last weekend.  I really enjoyed it despite some of my first-event issues.  Now I've got my eyes on the Gulf Coast Tri in May 2010.  It's  a HIM distance and I need some guidance on training.  I have about 35 weeks, so I feel confident that I have plenty of time to prepare, I just need to figure out the best way to go about it.  Most of the generic plans I've seen are 16 or 20 weeks.  I am guessing that I have two options:

1.) Get a custom training plan for 35 weeks so that I can start now and ramp up steadily to peak at race time.  Where could I find a resource for custom plans?

2.) Complete 15 weeks of base training (of my own design), then start a stock 20 week program.  If I were to do this, I would probably start by maintaining my current bike/run schedule and adding a swimming class. 


Swimming is my weakest leg and I need to get some coaching on fundamentals (either through a class or online) no matter which way I train.  This makes me think that maybe my #2 option is best, but then again, I want to get into hard-core structured training asap to make sure that I'm taking full advantage of the time that I have. 
Any feedback is appreciated.