After a long period of intermittent thinking, reading, posting, planning, and so forth, I have become convinced that ASP.NET may be the best way to go for a dating and social networking site, and (brace yourselves) not Linux/Apache/MySQL/PHP. Therefore:

What is the best such ASP.NET software out there?

This one looks like it may be the best I've found so far:

This one appears to show some potential, too, although may be much more limited in terms of standard features:

Does anyone have experience with any of the two above? What have I missed? Anything just as good or better out there (in ASP.NET)?