ive hered of wood grain steering wheels being bad coz in crashes they splinter into pieces ans can impail the driver, woodgrain looks nice but only iff its in suitble interior eg: vk calais with marron interior, but with ur interior clint i think personally it wouldnt suit as it would be to dark for the surrounding, if u could get a wheel in pine colour it would suit, thus y i vote for leather. safer (not splintering) and if in tan colour will suit.
ive got a gray steering wheel in mine and it dosnt look 2 bad, but it was out of my old car which was gray interior and i must say the same colour wheel to dash looked like a complete product, not out of place
Edit: just did a quick 2 second job on a leather wheel