2011 Race Planning

How does one come up with a race schedule?  How do you know what is too much, and what is not enough?  For 2010 I had lofty goals, but then life took an interesting turn and I ended up doing only one sprint tri, and a couple of road races.  Not at all what I had anticipated, but I won't dwell on the past.  Time to focus on the future.
So, I've been tentatively thinking of what events are a must, and what events are wishful thinking.  Here is what I've come up with so far:
Running Races:

• Tipp Hill Shamrock Run 4 mile hilly road run in early March
• Mountain Goat 10 mile, challenging course, early May.  Kicked my butt in 2010, I plan on owning it in 2011
• Boilermaker 15k on July 10th
• Empire State Marathon - my first 26.2! 
  

There will be a few 5ks and 10ks as well, but those will be time and financially based.  My only goal is to run a 5k and get below 25 minutes.  Might seem silly to some, but for me, it would be a great time.  I also need to find a half marathon to run in there at some point.

Duathlon

• Du the Lakes 3 mile run, 20 mile bike, 3 mile run.  Late April.  This will be my first Duathlon. 

Definite Triathlons:

• Green Lakes Sprint triathlon - mid June
• Iron Girl, Syracuse  Sprint triathlon - August 7th
• Skinnyman Sprint triathlon - Labor Day weekend
• Ironman 70.3 Syracuse - My first Half!  Yikes!

Maybe Triathlons, my boys and finances will play a major roll in these happening:

• Quassy Rev3 Olympic Distance Triathlon June 4
  
• Lake Delta Tri Olympic Distance Triathlon July 31
• Timberman Sprint Sprint distance Triathlon, August 20

Any input is greatly appreciated.  Should I do more?  Less?  Is this good enough with a 2012 Lake Placid goal as the end result?