I'd swear by my Saitek Cyborg 3D Digital (even better for Warbirds than MS FS, just 'cos it's a better game!).
Has a smooth throttle, twist grip for pedals (becomes natural quite quickly), 9 programmable buttons and an 8-way hat switch. Adjustable for left or right hand, for hand size, for prefered thumb positions (for top-mounted switches) and for left or right-handed throttle. Robust and pleasant in the hand, it only cost me £20, though the full price is £40 (worth that, I would say).