Also keep in mind that the EOS body will accept the full line of EF-series lenses with a lens factor of 1.6 - e.g. if you have an existing 300mm it now looks like a 480mm. Makes it handy for switching back and forth between film and digital bodies.
 
Either way, a 300mm zoom is a reasonable minimum for good field shots. We've used both an image stabilized and non-stabilized 300mm and I'm not sure image stabilization is all that handy for most of our launching, landing or field shots. It will slow down the shutter response time. A tripod or monopod may be more useful. Multi-frame is a must - 2.5/s is OK, 4/s would be nicer. 6MB format is really handy.

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