I have both -- the older one (f:1.9 50mm, f:3.5 35mm) and the newer one (50mm f:1.8, 35mm f:2.8, 35mm f:3.2). The newer one is both wider and taller than he older one; i.e., you can slip the older one into the newer one. The newer one is also shallower than the older one, with a larger viewfinder cut-out.
The newer one is indeed harder to find, but that current price seems a bit far out. I got one on ebay not too long ago, without the case, for much (much!) less.
cheers,
david