Mine (reasoning in spoilers):
1. Hakeem.
2. James Harden.
3. Calvin Murphy.
4. Moses Malone
5. Rudy Tomjanovich
6. Yao Ming
7. Elvin Hayes
8. This may sound crazy, but Steve Francis.
9. Otis Thorpe
10. Ralph Sampson
H.M. Clyde and Chuck only played around 200 games as a Rocket, on the tail end of their careers, so while they were good, they weren't good enough to climb over guys who were Rockets longer. T-Mac played 300 and almost got the tenth spot, but he was not the T-Mac people remember him to be while he was in Rockets red.
depending on CP3's ability to avoid age related decline and how long he spends here, could see him climbing up to 8th