Like Web and Jerry, I generally like AnkhSvn for Visual Studio integration, and also make use of TortoiseSvn as a complementary tool. (For example, Tortoise's log viewer is still a bit more advanced, so sometimes I'll go in with that.)
That said, I'm not totally sure I would suggest using AnkhSvn for ASP.NET Web Site Projects. (I use it for ASP.NET Web Application Projects, Class Library Projects, and Console Applications.) There are some quirks that you might find frustrating. See this message in particular and this thread in general, from the AnkhSvn mailing list:
http://ankhsvn.open.collab.net/ds/viewMessage.do?dsForumId=582&dsMessageId=132185
You could probably live with the quirks, and maybe the AnkhSvn will eventually eliminate them all, but in my case I chose to move to Web Application Projects (instead of Web Site Projects) partly because they work better with AnkhSvn.
Also, if you do go with AnkhSvn, I suggest running one of the nightly builds, rather than the latest stable release; the nightly builds seem to have many fewer bugs and to be more useful.