First Office SAN for virtualization with Hyper-V... questions

I'm having trouble getting everything together to pull the trigger on a purchase. I'm wanting to put a SAN in our office to consolidate storage and get some more redundancy in our network. I'm primarly running a 70gb Exchange 2010 server, a SQL 2008 server with about 300GB for all of our Databases, a few small sharepoint sites on some IIS servers and a "file server." The file server is what I'd like to replace with a SAN since the server hardly gets used other than just a place to dump network files for our 40 users. The entire server farm storage needs might be 2-2.5TB in total.

I'd like to be able to do this:
-Multiple Arrays with SAS drives for the Database and Exchange Server and SATA for file storage and Backups
-Be able to boot up VM's using Hyper-V directly from SAN
-have a backup image of all servers stored on the SAN for ease of restore in case of a server failure
-Possible use the SAN as a bootup volume for existing or future servers
-have network storage for my 40 users
-RAID6 at minimum on any arrays
-1.5TB on the SAS side and 6-8TB on the SATA side?
-Redundant power supplies and controllers preferred

All servers are Dell machines purchased in the last 1-4 years.

What makes the most since for an environment like this? PERC/SCSI? iSCSI? AOE? I would imagine FC is way out of my price range as I'm thinking my budget is anywhere from 5k-8k. I'm not opposed to picking up something refurb'd or building my own as long as the management software is easy to use. I've built a SAN for home use and didn't really bump into any issues but a place to store movies is not what I call "mission critical."