One game I've had for years - even painted the miniatures for! - but have still yet to play, is Iron Stars by Majestic 12 Games, a game of Edwardian space combat.
Brigade Models have a (small) range of ships for the game that covers British, Russian and Austro-Hungarian spaceships. Ever since I first read the rules and saw Brigade's ships I've wanted to play this game, so I bought and painted some Austro-Hungarians:
I believe that these rules would be very good - with some tweaks, such as altitude rules - for use with Brigade's wonderful Aeronef range.
Hopefully I'll be able to (finally!) arrange a game at the Winchester club