$2500 server for virtualization

I want to build a server of many Windows Server 2008 R2 VM instances to test a production environment with DC/web/database/file/print servers and client VMs with Windows 7. I want these VMs all to be connected on a virtual network.

I also want to be able to do fast video encodes on the host. I'm looking for whatever gives the best overall CPU & disk performance per dollar here. If there is a GPU configuration that does faster video encodes without sacrificing quality, I'd rather go that way.

I would like a RAID setup, redundant (failover) power supplies, surge protection + battery backup, and ECC memory.

My budget is $2500.

This is what I was thinking so far:
6x http://www.newegg.com/Product/Product.aspx?Item=N82E16822152185 for RAID 10
1x http://www.newegg.com/Product/Product.aspx?Item=N82E16813151213
4x http://www.newegg.com/Product/Product.aspx?Item=N82E16820139262
2x http://www.newegg.com/Product/Product.aspx?Item=N82E16819105266

I'm not sure where I can get a server case that can hold two power supplies and how to setup a failover for PSUs. Maybe I won't need this with a battery backup + surge protection. As long as a PSU failure doesn't affect the other components I'm fine.

Have you considered building a custom cabinet? You could probably save a boat load of money customizing the box to your spec's rather than paying for a premium built to order box.

If you are going to be doing high I/O operations (database/video), you are going to want to have different drives/arrays for each. If you ran all that off a single array, it would be waiting for the array all the time.