You are correct there are no Dell Win 8 drivers. I am using Win 7 64bit drivers.
You can try what I have done and that is Windows 7 allows you to boot from a VHD, effectively you would create a dual boot system running Windows 7 standard and Windows 8 from the VHD.
That way you can test the waters before hand. I was running for the first few months like that. Once everything was sorted out I clean installed Windows 8 Pro directly on the drive itself.
Using VHD Boot you can play with Win 8 and if it gives you any trouble, simply detach the VHD in Disk Management and delete the VHD, end of story.
I found a nice and simple step by step instruction see below:
How to Create Windows 8 VHD for Boot to VHD using simple, easy to follow steps.
In fact VHDs are great for testing things out without messing up your current setup.
I do hope that now that Windows 8.1 is nearly out that we will get the official Windows 8 Dell drivers. One can only hope.
:)