Kirk,
On our side, we have installed an XI dev system with 2GB Ram and 40GB disk space for application and database.
That's enough for test scenario but for productive ones we recommend to have at least 4GB Ram as the memory is shared by ABAP stack and J2EE stack and database.
I recommend to have look on the "Installation and Upgrade" SAP Marketplace's topics
You have sizing information in the SAP WAS Abap and Java installation guide and you can also get sizing information to take into consideration the message flow in the system sizing (XI SapMarket place documentation)
Regards
Nicolas
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