What pedals should I upgrade to for racing on the road and possibly track? I currently have SPD pedals on all of my bikes. I've stuck with them so far as they worked relatively well and I couldn't justify having two types of shoes. 

I can justify two types of shoes now.

These pedals/shoes/etc would be for my road bike and likely used on the track as I am going to spend a bit of time at the local velodrome this winter. My primary criteria is probably strength, with price second. I'm a sprinter and saving money is always good. Weight doesn't really matter at this point.

The Look and Shimano road pedals look good, but they have a number of different models across the board. Any suggestions or ones to stay away from?
I would recommend the Look Keo Classic pedals if you are not hyper-sensitive to the weight.  They offer a carbon version if you decide to spend the extra bucks for the lighter version.  Popular and well-liked pedal with the extremely common Look cleat style.

I picked my pair up from probikekit.com, they had the best price at the time and offered free shipping but YMMV.