Maybe another choice
http://forum.keypublishing.co.uk/showthread.php?t=81523
Here You have my photos with Pentax K100Super + Sigma 70-300 APO – my forst airshow photos with DSLR. Photos could be better, but i had sun into my face – not so good for photos…
When i asked in photographic shop about D40 (D40X has bigger noise) they tell mi that any Pentax is better that D40 🙂 (No, they had no any Pentax in the shop 🙂 ) – Now You don’t find K100S, only new K200.

(Sorry for my english)