Personally, I'd post the thread again, asking for guidance for a phono pre and cartridge under $500.00. That said, the little Cambridge is a great phono pre and will serve you well. The MC section, on paper at least - I have never tried the two together - should match nicely with the OC9. Perhaps those with first hand knowledge of this pairing will weigh in. I really think that the decision gets into taste issues as both are pretty great choices. You might just parse the forums here and on Audio Asylum to get a feel for the differing flavors of the cartridges.
My choice would be the 150, for four reasons. It sounds a little chunkier than the OC9, which I like, and you might not. I believe the MM stage of the Cambridge is clearer than the MC stage, albeit based on limited comparisons using a Denon 103 straight into the MC stage and with a transformer into the MM stage, the output of this cartridge being below the suggested MC range. The user replaceable stylus on the 150 lets you reload, so to speak, for less money. And finally, if you later choose a preamp or phono stage that only has MM capability, perhaps a tube pre, you obviate the need for an expensive step-up. Just some thoughts, there are no rights and wrongs here and most of the surviving LP replay products are damn good. I believe that you will really enjoy your new rig, whatever the choice.