Taurus Engines - Bill Oberdieck....nice guy, great service, and stands behind his product 1000%....T-52 with a Pitts muffler will be around $659, if I recall. Call him...some info on this site;
http://www.taurus-engines.net/

Regards the comparisons of motors....I've owned the ZDZ 40, the ZDZ 50, and the Taurus 52.
For lightest weight power - the ZDZ 50
For SMOOTHEST power, and most cost - Taurus 52

If you have not ever seen, or operated a Taurus, then you can't voice a valid perspective on how incredible the carburetion and transition is on this motor. It's amazing.

My ZDZ 50 is darn close. Nearly the same in power, I think, although it isn't fair to say because I've not run both side by side, although I have the Taurus in my Pitts, and the ZDZ 50 in my Wagstaff Extra.

I know nothing of the BME, or the DA, because I have no personal experience. But I *can* tell you my experience with the Taurus and ZDZ. Either would be a great choice!

Is one "better"....well...depends on which kind of car is "better" to you....