I'd forgotten to include my Gillette Fatboy in the original list. I thought I still had a Merkur 12C Open Comb somewhere around here too but I must have moved that on already.
So, to update, I have ten at the moment. It'll soon be down to eight though because I'm planning on dropping the 37C, Progress and Futur. And buying an Above The Tie, Atlas R1 or R2.
1. Merkur 37C.
2. Merkur 39C.
3. Merkur Progress.
4. Merkur Progress Long.
5. Merkur Futur, Brushed Satin.
6. Gillette English Red Tip Rocket.
7. Gillette Toggle.
8. Gillette Fatboy.
9. Above The Tie, Kronos H2.
10. Above The Tie, Bamboo SE2.