How about a Serfas Niva? http://www.amazon.com/Serfas-LX-2-Ni.../dp/B001AIS5C6

They aren't too expensive. They are well padded without being mushy. They have a cut-out.

They are a bit on the pear-shaped side, with a gradual transition from nose to sits, but unless you need a really T-shaped saddle it should be fine.

Pretty easy to find used, don't pay more than $20 for a used one.