Good database for superfast storage of large amounts of financial data?

I'm storing large amounts of financial data for options. Recommendations for a database to store this data?

Edit

• "large amounts" is 1GB initially, scaling up to around 100GB at some point in the future.
• Fine with either commercial and open source.
• Developing with Microsoft Visual Studio 2010 and C#.
• Latency/retention per开发者_如何学运维iods: need to store streaming realtime data in such a way that I don't lose any of the data coming in (probably about 10KByte/sec maximum data to store). Querying can be performed outside of market hours, so speed of querying is not an issue.

Since this is a Microsoft-based project the obvious choice is Microsoft SQL Server, which has very good integration with C# and Visual Studio.

100GB is not large.