Whats the best Cartridge for a bright Pro-ject 9 ?

Keep the 20X and try a warmer sounding phono stage. Perhaps a tubed unit. One that allows the cartridge to be loaded a bit. If you're after a "warm" sounding system you may have to reconsider the whole chain and not rely on the cartridge to get what you want. The 20Xx is just telling you what's in the groove. The rest of the signal path gets to shape that information to produce the final sound. (You don't specify what you're running so I'm just throwing out suggestions.)

Tom

Zeal, try lowering the back of the arm as dynavectors correct vta is a touch low in the back.

Tketcham,
I am using a Pro-ject 9 I bought on Audiogon. the inter connect is a Synergistic Research Looking glass to a Rogue Audio 99 pre amp. I am also using a music fidelity phono amp.

If you have a 20XL and are running it at 100 Ohms loading with your MF X-LPS than it may sound a tad bright. If you have a 20XH and are running it at 47K it may also sound a little bright. Running the 20XH at 100 Ohms may dampen it too much, but it's worth a try if you haven't already.

For comparison, I'm running a 20XL (on a mmf-7) at 34 Ohms loading (headamp to Rogue Stealth phono stage) with a SS integrated amp and it's sounding darn good right now after about 50 hours of break-in. Detailed yes, bright no, with plenty of low end and mid range.

Tom

How about a smooth sounding moving magnet such as a Shure M97XE, or a Denon 160 high output moving coil. Both are slightly on the warm side of neutral.
Michael