The intake with the larger ports is probally going to flow more, but the velosity will be reduced. So if you have 10% more air in volume, but moving 20% slower, then in reality less air is flowing. The only way to make up for this is to have an engine that can pull more volume.
If you plan to supercharge, and want an intake now, go with a RPM II or a Systemax II. You probally won't see any more power increase than a ported lower, or smaller intake, in fact you'll probally loose a noticable amount of torque, but down the road you'll be glad you did.
To be honest, I would go ahead and save for the Supercharger. Building a blower motor and a naturally asparated motor is different, so it will help you along in your buildup. If I could do it all over again, I would have just done suspension and a turbo from the start.