Suggestion: Take a look at the Fizik Gobi.
I purchased one to eventually put on my MTB, but temporarily put it on my TT bike while I was waiting for my Arione Tri to arrive. I found it to be very comfortable, and still have not put the Arione Tri on yet.
Here's how they compare (my opinion):
Same wingflex as the Arione & Arione Tri.
Similar weight (250 vs 230 grams)
Same usable length - the Gobi just doesn't have that rear point, but nobody is going to sit that far back.
More padding in the nose than the Arione, but still narrower than the Arione Tri.
Slightly curved rear of the saddle - good for those who don't like flat saddles.
Similar to lower cost, depending on where you get it.