I've had the same pair of sidi dominators for 5 years, and they are as comfortable as all get out. the fact that parts (buckles, straps, soles) are replaceable gives a percieved value added to the shoe. However, the price of replacement parts is steep, which will quickly bring you back to the cost of a new shoe.
I found the soles to wear quickly, which is a disadvantage in technical terrain, but then a gain, it seems like I push my bike almost as much as I rde it
. I found the cheapest price for these shoes from a european web site, chain reaction cycles, but you may have some luck with '05 closeouts, if you can find your size.
jdog: did you need the next size up on the winter shoe to accomodate heavier socks?