I dunno.
SPD shoes aren't really that important. All they are doing is binding your foot to a peice of metal that it should always be in contact with. There is no impact, no heal toe motion that generates rubbing.
Mine are cheapo schimanos, about £45 iirc, they are scratched to hell, but still comfy and going strong. I do need to use my watercovers on them thou, as they have lost all their water resistance if they had any!
Edit: meant to add, get the ones that weigh more with the rubber around the SPD, this way you can walk in them too. The ones that are flat with no tread, just the spd are a pain.