What type of Database Software should I buy

[Jayhawks]

I am a newbie who is planning a program that will store about 100,000 records in a database.
One table will contain 10,000 30 second sound files ( probably .mp3)
Another table will contain 10,000 .jpg images
Another table will contain 10,000 30 second .wav videos
The remaining 70,000 records will be strings

How do I make an informed decision on what type of database to use?

I don't know if it matters, but I'm writing in C# using Microsoft Visual Studio 2008 Standard Edition.

[Arjay]

Since you are already using Visual Studio, why not stick with the Microsoft family?

Check out the various editions of SQL Server 2008 (http://www.microsoft.com/sqlserver/2008/en/us/editions.aspx). There are free versions available all the way up to enterprise level.