Coldfusion JVM - Dedicated Server

I have a question regarding CF10, CFMAIL and JVM settings.

We have dedicate CF server with 16GB memory that acts as a feeder to PowerMTA (SMTP).
There is nothing else on the server - CF10 ENT only.

We send CFMAIL in a loop to app. 100,000 with content size of app. 25K.

We are spooling the mail to memory.

I was wondering what the best JVM settings would be for this config.

With 16GB - what settings would you recommend?

-Xms1024m -Xmx1024m

-XX:PermSize=1024m -XX:MaxPermSize=2048m

Also, any garbage collection settings you would add to ensure no Out Of Memory errors?