SBUU and m1000e iDRAC

Looking at build options I see many ways to choose from.
Considering
- iDRAC already allows mounting of Virtual CD/DVDs - from ISOs on a share
- Microsoft Auto Install Kit - (AIK) - also allows for Unattended install and Image capture and re-deploy
- There are other Image capture deploy softwares like ghost... etc

I do want to load some Pre-Install software (like WinPE) off the NET with either PXE boot or iDRAC Virtual CD/DVD -
Now do I first PXE boot SBUU?

So confused:
I do know that SBUU would be good for Firmware upgrade management and Raid Creation (will have PERC6/i on each blade)
I did not see how SBUU (from Demo at Dell web site) supports "Windows Server 2008 Product KEYS.
Consider that after initial Hardware install at the DataCenter I will be completely Remote for each Build

Can someone please suggest best practice?
I'm in a green field without LAB hardware yet.

Thanks in advance,
RandyJS