cm crossroads information Questions

Currently we using basic version of CVS & SVN. Plan to switch to better SCM tools so thought of few options git/svn/perforce/mercurial, skipped clearcase because of its pricing.

My company has a strength of 200 developers. No multi-site, we use Bugzilla as defect tracking tool.We are open for paid tools if they suite to be best among all. But not as high paying to clearcase :)

Things which i wish to consider-
1) Easy merging
2) if PM is add-on then great
3) Easy adaptability for dev

Experts, can you share your views.

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