I'll go for it again...
I have this one from synergymetalworking.com. It is 15.5 gal. I am doing 13+ gallons in it at present with a blow-off vessel (corny). It's working quite well and I know I can do more (gonna try 14 next).
I can fit my whole arm down the 4" triclamp to the bottom to clean (and the top as well) since I'm no he-man. Sure it's not a 60 degree cone, but with a sanitized spatula, I can harvest the whole cake very conveniently and separate it in a glass container (with some sterile water). Even without doing that, I got about 2 vials worth of yeast out the 1.5" bottom dump with just one purge.
Best things about this are:
1) It can be pressurized to 60 psi, unlike all others I've seen on the market (EDIT: Well, I guess except the Sabco which is like the same thing). My last batch was fermented, cold crashed, boost carbed, and served from the same vessel, just like a brew pub. My current batch is seeing a pressurized ferment.
2) It's American made. Well, the keg is actually French, but it's not a Chinese import (not that there's anything wrong with that but,....)
3) On mine, I have only one weld below the beer line (the 1.5" dump) and zero threads. Having everything accessed (even thermowell, racking port, etc. except the dump) from the top makes using a chest freezer a preferred choice. Very low profile. I just put a 90 degree triclamp elbow so I could reach the dump valve in the chest freezer.
It was about $450-ish +/-.
I also bought a 15 gallon corny keg for ~$200 (factory second) as a lagering/second primary vessel. This thing is really cool. It's easily half the weight of the Sanke and has a nice thick rubber bottom. Haven't used it yet, but going to shortly. That's a pretty good price for stainless with posts and dip tubes already present. Again, just harvest the whole damn yeast cake this time out the bev out post with a little CO2 and separate in a different container.
My humble opinion: The whole 60 degree cone thing is just not that important on the homebrew scale. When you have multiple barrel volumes of beer pressing down on the yeast cake in a big brewery, you need to remove the yeast (as much of it as possible) so it doesn't cook and loose viability. That's just not the case with 15 gallons.