I'd probably go for the Wyeast 1469 West Yorkshire, though I've heard of WLP500 being used, which is the Chimay yeast, and that sounds like it'd be great too.
Where I purchase my ingredients from has three grades if you like of crystal malt. They are listed as crystal malt, light crystal malt & dark crystal malt. I just use the one listed as crystal malt with an EBC of 152 unless a recipe specifically asks for light or dark.