Hi!
Someone here sayd that if you can afford yourself, you can use SQL SERVER 7/2000.
well, it's realy doesnt metter, because most of web application developers doesnt realy host the sites, they just build it and use a web-hosting company that hosts their sites.
Most of these web-hosts uses Linux as there OS, so it's realy a question of what your hosting copmany uses, if it uses Linux/UNIX it will probably use mySQL otherwise with will be SQL Server, so my point is if your gonna target your Application to a specific Database Program (this case using ASP) target it to the Database your hosts use.
If you ask me ill write all my web application in JSP, using JDBC, but that's my choice.
Hope I could help, if you want you can email me :