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HP NAS 1500S Array Partitioning Issues

I currently have a HP NAS 1500S (32-bit hardware) which originally came with less than 640 GB worth of raw disk space (4 SATA HDD's) and Windows Storage Server 2003 (32-bit).  My boss is telling me that I can upgrade the OS to Windows 2008 (32-bit), replace the SATA controller with an Adaptec SATA II 2420SA (4 SATA connectors) and use 4 2TB Seagate Barracuda HDD's. He keeps insisting that I can use RAID 5 on all the drive to do this.  I am running into some issues:

1.  I cannot create 1 logical RAID 5 disk and boot from it in Windows 2008 because of the MBR limitation of 2 TB.

2.  I can create one 2 TB boot logical disk and use the other 3 disks in a raid 5 using GPT partitioning, but that leaves the boot partition vulnerable and not redundant.

3.  I can create two (2) RAID 1 logical disks, but that defeats the purpose of investing in such large hard drives.

Am I wrong in thinking that this cannot be done on this hardware alone?  Do I need to use Itanium hardware and/or EFI to boot from such a large RAID 5 logical disk (which this hardware does not have)?  Are there any SATA controllers that help with this type of configuration?

Thanks for your help in advance.
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FYI - I also updated the Adaptec with special firmware (from Adaptec support) to allow it to see drives over 2 TB in size.
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David
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I think that controller can split a single RAID 5 into two logical disks so that one is less than 2TB for MBR boot and the other greater than 2TB for data on GPT partition. As yo probably know it's what Windows sees as the disk size that matters and seperate logical disks on one set of spindles gets around the GPT / boot problem nicely.
I've got two IA64s here, and I agree, there is NO upper limit on the size of the "C:\" disk.  (well, the limit is bigger than you will need today, and I tested on the IA64 version of Win2K3 .. but it will work).