Well Greg... I think the bottom line comes down to Money.

From what I have seen of these kinds of tools they are horrendously expensive for the good ones (And why wouldn't you charge a heap considering the market).

My first suggestion would be to do some searches on the internet for this kind of software using keywords that describe what you are looking for.

My second suggestion would be to look on sites like www.softseek.com and www.shareware.com to see if there is anything there that may be useful and possibly shareware.

My last suggestion would be to use a repository like VSS and generate your own front end to be able to handle everything VSS in its native form is incapable of doing.

At the very LEAST I do applaud Visual Source Safe for giving you an object library to mess around with, giving you the possibility to create what you need where it fails miserably.