Hyper-V Development Server - best 4 drive configuration?

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http://serverfault.com – We're building a development Hyper-V server that will be shared among 4-6 .Net developers. We'll be running mostly Win2k8R2 VMs with services including MSSQL, SharePoint, TFS, continuous integration, etc. Again, this is a dev machine used for development and testing - so no production-grade SQL performance is expected - but IO is certainly a concern in any virtualized environment. We'll be getting an old production-class server for this purpose after it is replaced with new hardware in about 6 months, so in the meantime we'll be using a Dell Precision T3500 workstation with 24GB RAM (triple (HowTos)