I did a test ride in the Marielle and HATED it! There is something about the way the bars for the leathers are angled that pushed my calves into the thigh blocks. Also, I tried a wide, but it was still much to narrow for my WB/TB monster. Actually, it was the test ride that pushed me over the budgetary edge.
Ended up with a new Stubben Genesis which I love, love, love! Unfortunately, it blows your price range out of the water, even used. Stubben also had a monoflap that I rode in, the Excalibur, that made me drool. But I needed something I could flat my greenie in too and its thigh blocks were too big....maybe once we're riding the grand prix circuit I'll make the investment. ;)
SmartPak has a great test ride program. I'd get the Marielle and try it before plopping down your cash if that is what you think you are wanting.
I was at Red HIlls a couple weeks ago and they had Dutton's new saddle, which looks pretty dang cool. It actually has vents and cut outs to make it lighter weight. I think it is like 7 lbs or something ridiculous like that. Unfortunately, probably also over budget since I doubt there are used ones floating about.