Confirming what MusicMan06 and jaspal are saying. The Altmann Attraction is a NOS DAC, lists for around $1600, is battery powered, and is not a DIY kit. The AudioSector NOS DAC is typically sold as a DIY kit and can be purchased for less than $400. A nicer case for the AudioSector rather than a plain wood board can be had for less than $200 more. For more information, go to the AudioSector site and email Peter Daniel.
The TADAC does look interesting. I've heard good things about it. No USB however, and these days I think all DACs should have USB input. A Macintosh or PC (with asio drivers) is a world class transport.
Lack of a volume knob shouldn't be a show stopper. Niteshade Audio will sell you a passive preamp for $150 which is (and I'm only guessing here) likely better than the volume pot they stuck on the CityPulse anyway.
Everyone's ears are different. While I will never be a recording engineer, that shouldn't prevent me from enjoying listening to music in my house. =) The CityPulse is probably not fatiguing or harsh or thin sounding to many people, but it, and the Benchmark too, do sound that way to me. I stumbled upon NOS DACs less than a year ago and haven't looked back.
As for the Benchmark's popularity in recording studios, my guess is that the DAC is a tool, one tool among many that a sound or recording engineer may use to help them engineer a track. The Benchmark's hyper detail is no doubt very, very useful. Whether the same recording engineer would go home and prefer to listen to a Benchmark over some other well regarded DAC in his or her home stereo system is I think a relevant question. Whether his or her home stereo would be representative of something an audiophile might have is, I think, an interesting question too.
I'm a software developer by trade, and when I'm at work I use debuggers, assemblers, linkers, etc. As I write software I need to get into the details of the code, and I need to use tools to assist me in that effort. But when I go home and I'm browsing the web for enjoyment, there is simply no desire to pull out a debugger to see how Firefox decodes it's HTTP headers and how IE renders HTML to the screen.
I fell in love with computers at a young age, and later on fell in love with the Apple Macintosh. When I worked at a video game company programming with Microsoft Windows and Visual Studio, I still went home and used my Macintosh for everything that wasn't work related. I guess what I'm saying is that we shouldn't necessarily confuse what one uses professionally with what one loves and uses personally.