What portal framework and container to choose?

Question

Hey Guys,

The question what portal framework + container should I choose?

The possible combinations:

1. Liferay && (Glassfish 2 and 3 || JBoss+Tomcat 4.2 || JBoss+Tomcat 5.0 || Jetty || JOnAS+Jetty || JOnAS+Tomcat || Resin || Tomcat 5.5 || Tomcat 6.0)
2. Pluto && Tomcat
3. Gridsphere && Tomcat

I'm unexperienced with portal development, my thesis has a deadline, so I'd like to keep the learning curve as short as possible.

Cheers,

Anna