How about no?
No. No! NO!
Why is it so hard for people to realize that the software components that make it "Mac OS X" are not part of Darwin.
With Darwin, you get a Mach-powered BSD-like UNIX. That's it. It's NOTHING LIKE OS X.
Rhapsody is. Rhapsody DR2 looks nearly identical to Mac OS X Server 1.x, which then evolved into Mac OS X. It looks much like OS 8.5.
OPENSTEP is less like OS X, but not by much. You'll still see where parts of it directly evolved into OS X.
If you get Darwin, you'll be sorely disappointed when you find yourself simply staring at BASH.
Get Rhapsody DR2 or OPENSTEP. Do it. You'll thank yourself. You'll suddenly realize what's been missing from your computer using experience.