Can anyone recommend a decent business intelligence & reporting application that can be integrated into an OEM application?

Primary requirements are:

• Administrators can define cubes/dimensions etc (or we - the OEM - can predefine some)
• Report designers can easily inspect data by visually selecting dimensions, filters etc in an adhoc way that is quickly output with little upfront investment
• Report designers can design a report based on dimensions/filters and save their definition to be run as required
• Report viewers can view the reports defined by the report designers

All of this plus in .NET that can be branded/integrated into our existing web application's look and feel.

Permissions need to work off our user/groups system.

I've found a few that look good, but they are all in Java and I don't want to ask our clients to install ASP.NET for the app, and then Java, tomcat etc just for reporting.

Thanks