Including SQL Server Express with Application

I'm bundling an application for distribution and SQL Server is a prequisite 开发者_开发问答so we're including SQL Server Express. What's the easiest way to include SQL server in a point and click installer? In the past I've used NSIS, but it was always flaky when installing the .NET Framework, so .NET, SQL Server and our app seems like an impossible task.

It needs to be free, which probably cuts back my options a tad. Any suggestions or recommendations?

WIX? I would use WIX and the bootstrapper would install SQL Server Express.