I have a Collegiate Diploma and I ADORE it. If you've got a long femur though, I'd recommend the Collegiate Alumni, or the Bates Caprilli CC. I've never ridden in the Alumni but it looks like it would fit a longer thighed rider well. When I was saddle shopping I rode in my coach's Bates Caprilli, and found it REALLY comfortable. My only qualm was that it seemed to put me in a chair seat, but after reading some reviews I found that that seemed to be a recurring issue in riders with short thighs & long calves like myself. :) I really loved the saddle besides that and would recommend you give it a try if you can!
Also, for the record, I find the Caprilli CC runs a little bit big, just a smidge...my coach's 16" fits more like a 16.5", another one at my barn is 16.5" but fits like a 17". Just something to keep in mind :) I can send you a picture of my own Collegiate Diploma that I adore, if you'd like! They're very similar saddles.