Specific specs on the CPUs?
These are minimum - maximum price ranges (including a Windows Server 2008 R2 license lease and a 100 MBit connection)
1) 15 - 25€
2) 50 - 70€
Waiting for input on CPU for 3) & 4).
The thing about dedicated server reselling is that you need to offer your customer something that they don't get from the initial host (ie: support, custom installations, etc). You cannot beat the server prices of the big guys since they sell and buy in bulk (ie; OVH). For instance, our database and webserver costs me about 50€ / month and has the following specs:
i5 4x 2.66+ GHz
16 GB Ram
10 TB bw / month, after that: 100MBit -> 10MBit for all OVH to internet traffic
Since I don't need their support and I can set up everything myself, this is one of the best deals I have found so far.