Is there a good git client for Mac OS X that has all the bells and whistles of Conerstone or Versions for Subversion?
I am wiling to pay good money for it if it has all the most common features and polished look. Also, I've seen gitx and I am asking if there are any other GUI clients besides gitx.
Please take a look at this overview of all graphical Git clients.
XCode 4 has some very nice git support. If you're registered with the Mac Developer program you can download a copy of the beta.
Although, looking at the homepages of Cornerstone and Versions it seems that they have quite a lot more "version-control related features" than XCode 4; but XCode has the advantage of integrating version control into the editing process. (Check out the WWDC session video on it to see what I mean.) So I guess it depends quite a lot on whether or not you currently use some version of XCode for your coding.
I'm partial to Sourcetree, myself.
Gitti look promising... is in private beta at the moment: http://www.gittiapp.com/