My Gyes Swallow copy is comfy enough for shorter rides (50 miles or less) but after 80 miles my nether regions are numb and I worry about my powers of performance, ahem.
I noticed a Brooks B17 Imperial with perforated and laced sides, in good shape, for $75. What do you think about the cut-out saddles? It's enough money that I won't buy it on a whim, but not too much to buy it for a reason.
There is also an old Brooks Professional with the copper rivets and mile-thick leather, but unfortunately the leather on the nose is looking iffy - the upper rivet hole on the nose is elongated and I worry if it will last. Only $30, though.