Like many players, I am always on the hunt for another bocal. When I was first getting good at the bassoon I was very happy with my sound and then i tried a new bocal and my sound was all of the sudden SO much better. I think that experience created new way of thinking, that there is always a richer more vibrant sound that i can achieve.
So now I have a bit of a bocal collection going. I really only use one bocal everyday and then I have some specialty bocals. I have: Fox *CVX*R2, *CVX*2, CVC2, CVC3, C and then a few no name bocals that came with my student instruments. I am not a very big fan of Fox bocals but when i try a batch of them i usually find a good match in there. Fox bocals have also in my experience been the most consistent. I have had a few used Heckel bocals sent to me on consignment and there is a drastic different between two bocals of the same model.
I purchased a Fox *CVX* R2 last spring and so far it has been the best bocal I have paired with my Fox 601. It has very little resistance and great pitch control for low notes. The high notes are a little harder to get out than on my *CVX*2 which is the only reason i have a *CVX*2. My two CVC bocals came with my current bassoon and for me they aren’t as vibrant as i would like them to be, they tend to be a little muffled and don’t have the high notes.
I am VERY lucky to work down the street from Forrests Music. After work or on lunch breaks I often go over to test used instruments and bocals. I have gotten the chance to try out the Paraschos bocals and the Leitzinger bocals. The Paraschos bocal comes in two forms, one as basically solid wood and the other lined with metal. In my experience the Paraschos lined with metal seems to be more resonant and the solid wood version muffles my sound. These bocals are also new so I’m not sure how long their live expectancy is (cracks etc.) Now the Leitzinger bocal is another recent addition or at least in the last few years. There are so many different specifications for these bocals; alloys, length, bend, plating and taper. I haven’t gotten to try all of the different options by far but for the few bocals I tried they seem to be very open and vibrant. Easy playing in all ranges but again i think certain models are better suited for the highest playing. Id seriously consider a Leitzinger as my next new bocal.
Last week I tried the Leitzinger bassoon as well, it seemed to me like more of a gimmick. Like they have great bocals and now they made a “bassoon to match.” It’s priced “competitively” at $24,000. I only got a few minutes with one, and I know that we are all used to our own instruments but the pitch and projection wasn’t even as good as a Fox 240. The f# and g# keys also must have been drilled incorrectly because anything involving those two keys was uncontrollably sharp and had far too much resistance.
These bocals can be found new or used (on consignment):
http://www.millermarketingco.com
Kristopher King 
I came across your comments on trying a Leitzinger bassoon by accident as it comes up on google (your comment on gimmick!). SO just wanted to say have a read of my Leitzinger experience at http://musicmatters-bassoon.blogspot.co.uk as six months on I am even more happy than when I wrote that blog. I hope you get to try more of his bassoons and see for yourself.