First big race season 2010 (too much?)

I have done a couple 1/2 marathons and did 2 sprint and 1 olympic tri last year. I am only able to do an 8 mile and 1/2 marathon this year. I am trying to figure out what to do next year. I would like to do a marathon (flat course) in May, HIM in July ( Steelhead) and IMFL in November.

These are all first time races for me. Obviously the IMFL in Nov is my “A” race and that is where my focus would be and the marathon and HIM i would look at as training races.

I do not have a “strength” but feel most comfortable with the run. I live in Northern Michigan so I would not be outside on the bike until April or May anyway.

Am I biting off too much too soon, or is this something doable with the IM in Nov as my “A” race. Thanks for any input