My gf recently got a Selle SMP as a cure for a similar problem and loves it. Looks a really good design and I'm tempted to try one too. They have cheaper ones too - the TRK and the Hybrid - so you don't need to shell out 150 notes for one of their road models. Well worth a try i think.
Otherwise SLR Gel Flow for me, I've had numbness issues in the past too.
Ah awesome, that's what I wanted to hear - that the saddle does actually work. The Hybrid looks a lot less crap than the TRK, so I will probably give that one a go first.
Cheers!