We are planning to implement a system for logging a high frequency of market ticks into a DB for further analysis. To simply get a little what kind of storage performance we can
I would consider checking MySQL 5.5 release candidate as well. Oracle guys made significant improvements in this version, specially for windows release. Up to 1,500 percent performance gains for Read/Write operations, and up to 500 percent gain for Read Only. You can refer to this link for more info:
http://www.mysql.com/news-and-events/generate-article.php?id=2010_04