Having used TFS 18 months back I found it buggy, slow, annoying, very limited search criteria and it had the feel of a product rushed out by a team of un-interested, under paid, over worked techs being forced to use Sharepoint and other MS technologies because that's what marketing wanted. Seriously it was a dog, I would have rather used SourceSafe!
SVN on the other hand is bit techie, IDE integration is a pain, and it can occasionally get confused, but the user base is massive and most issue can get resolved with a quick SO quesition.
Have you considered Vault? Works well, and isn't too pricey.
