RAID recommandation

Hello,
I bought a new Dell server – 8 Harddisks of 1TB each. I will install win2008 on it.

Which Raid configuration shall I do ?

Generally I want to have partition C of around 40gb for the windows etc, and D (and perhaps E) for all the Data.

I tried to play with it, it didn’t allow me to create all the 8 disks on 1 RAID5 array.
It allowed me only to make 2 RAID5 arrays, so I made 3 disks into 1 RAID5 and the other 5 into a second RAID5.

In this case from the first array I made c (system) into 40gb, d (data) into 1.8TB and e (data 3.6tb).

Any suggestions ?

Thanks,
Yoav