Ollie,
I attended almost 20 airshows in 2005 and I never saw anyone digiscoping. Airshows tend to display small and/or fast aeroplanes so 300mm will be a minimum. Most of my photos taken at Old Warden in October were through a 200-400f4 with a 1.4TC giving 280-560mm f5.6 which is overkill but I did not find 280mm as a minimum a problem. A low cost and popular lens seen at airshows is the Sigma 50-500 or 170-500 costing approx £5-600 and if you want to be thrifty, try obtaining a used copy as you have until May before the season starts again.
Nikon have just launched the D200. I would imagine the used market would have some good examples of D50 and D70(s). I would avoid e-bay as I have only have bad experience but try Jessops/Jacobs/Mifsuds or Grays of Westminster who grade their used items and all allow haggling!
Why not place a wanted here, you might be surprised what comes of it.
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