I talk to myself all the time, to the horror of all my co-workers.
OK. You could try a query hint in this case, the OPTIMIZE FOR hint might help out. Experiment with it. In 2008 you can also OPTIMIZE FOR UNKOWN, which can work really well.
"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
- Theodore Roosevelt
Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning