Will this Upgrade Plan work? ESXi4.1 to ESXi5.1 upgrade + one Datastore Disk Upgrade

Background:

Dell T710 Server, 96GB memory  (using 40GB now).  Standard ESXi4.1 and 11 VM's.  10 of the VM's are Windows 2003 and one is SCO Unix. Two RAID Arrays using VMFS 3.46.  One array is Raid 10 (6x100GB) = 300GB and one array is Raid5 (8x300GB) = 2TB.  Each array is a different Datastore.   There are 9 VM's on the 2TB Datastore and 2 VM's on the 300GB Datastore.

Goal: I want to upgrade to ESXi5.1 first.  Then I want to replace the 6x100GB disks in the 300GB Datastore with 6x512GB disks.

Planned Steps for VMware Upgrade:

1. Put in Maintenance Mode
2. Shutdown all VM's
3. Backup all VM's.  I can do disk to disk backups over to other 4.x Datastores on other Servers using our VMX software tool
4. Use ESXi 5.1 Upgrade CD
5. Upgrade ESXi, preserve VMFS Datastore
6. Review Upgrade Logs and resolve any issues
7. Enter upgraded license keys I've generated for 5.1
8. Upgrade VMware tools on 9 of the VM's using UI.
9. Upgrade the 2TB Datastore to VMFS5 from 3.46
10. Power up only the 9 VM's on the 2TB Datastore and validate.

Planned Steps for Disk Upgrade

Recall that there are only 2 VM's that are on the Datastore with 6x100GB disks.  I already have backups of them from the previous step.

1. Shutdown all VM's currently up (should be 9)
2. Delete Datastore on the 6x100GB disks
3. Shutdown VMware
4. Shutdown Server
5. Pull 6x100GB disks and label with sequence
6. Insert 6x512GB disks
7. Power up and use Dell Tools to ensure 6 new disks are recognized and configured as RAID 10.
8. Power up VMware
9. Create new Datastore on 6x512GB disks.  Should be VMFS5 version.
10. Restore VMBackups for two VM's that were on the 6x100GB disks
11. Upgrade VMware tools on 2 VM's
12. Power up other 9 VM's and validate

I'm assuming that the VMware is installed on the 2TB Datastore but not sure how to verify....

Any recommendations or changes?

Thanks in advance!