Ugent Help needed ! PowerEdge 2650 not compatible with Windows SBS 2003 Apparently????

I have just received a new Poweredge 2650, I've tried to install Windows SBS 2003 using the Dell Server Assistant as usual but I get the error message that I'm trying to install SBS 2000 and to insert the Windows 2003 Server CD.

I've rang Dell support and I've just been told that the Poweredge 2650 doesn't support Windows 2003 never mind SBS 2003, surly this is complete rubbish...

I've installed SBS 2000 on a great deal of Poweredge 2600 range without a problem, is it just case of carrying out a manual install ?

And then loading the Dell tools after?