Hi Alberto,
I use a Selle Italia nowadays. I think it is called Gel Flow or something like that. Main thing it has is the cut-out bit in the middle which works for me in a more leaning-fowards position. I also use their TT one on my TT bike.
I got the Gel Flow because I knew the brooks wouldn't work for the 24-hour TT (I remember being thoroughly sick of it by the end of the Dean and not able to lean forward on the last third of the ride without it being painful), but TT saddles wouldn't be right either as they are really designed for short distances.
But it is trial and error. The Selle Italia suits me but I am sure it would be torture for some people.
I've had the same gel flow for about 10 years on the mtb, and another one with the cut-out hole in the middle on the road bike for years too. Not bad at all, except on very long rides, when they become uncomfortable. I am going to experience with a swift for a few months to see how that goes for >10 h rides. The B17 on the tourer is good also, yet I kind of feel it rubs a bit much on my legs after a while, so got a more racey one instead...will see...
Now just need to find some hills around Cambridge to practise on 

Moved back to the UK after a year in Cyprus following early retirement. Put in over 12,000km during my time in Cyprus (well it's easy to get out on the bike when the sun shines) but less than 10% of that since arriving in the UK in June so have registered my intent so ride LEL 2013 and will hopefully get a place as a means of motivating myself to get out on my bike on a cold/wet/dank NW morning here's hoping it works. Never ridden and Audax but used to me a CTC'er so plenty of their reliability rides 144 in 12 etc etc Just done a very silly thing and sold my sensible car that I could throw a couple of bikes in the back and bought one that won't accommodate a single bike so my training will have to be based in the NW (not a great problem there's some great cycling country here) or possibly ride out train back or vice versa. Just ticking over on the bike right now averaging around 200m a week rain permitting but will hopefully start doing a lot of longer multi-day rides once the worst of the winter has passed so fingers crossed Hmmmmmmm wonder how mad it would be to ride my Pashley 