Best Vehicle System?

[Scowling Dragon]

Buh...Please help me out people and introduce me to vehicle systems, or something.

So far I have tried:

Base Pathfinder systen: Crap. Its slow, unweildy and uncustomizable
Fire as She Bears: Massively massively overcomplicated and fidgety.
Ships of Skyborne: Close, but the maths are off on the firing of weapons and I would prefer something level based.

[Psyren]

This might be a better fit for General Roleplaying so that you can crowdsource answers from non-3.5.-based systems too.

[Scowling Dragon]

This might be a better fit for General Roleplaying so that you can crowdsource answers from non-3.5.-based systems too.

Well again I need one 3.5 compatible.