Cartridge recommendation

Denon 110 is actually better than the 160, I have a 110 in a Scout and it works very well, the VPIs mass isn't that different from the 300, which I have used in the past. I would go with it but the Ortofons are good also.

Photok: okay, you made some solid buys. The Denon would be my favorite choice, but is not ideal with the Cambridge. I had them together. The ouput is low enough that your amp. will need make up for that. Some people don't mind this, but I had a small amp. You may experience a significant difference in volume between other souces.
Budget wise the Audio Technica AT120E ($80) plays well. The Ortofon Red I only heard briefly and can't make a call on that. The Blue is well liked, but there are a lot of options below $200 to get started. I'm a fan of the LP Gear house brand. I own a DeftII ($100) and that is hard to beat for a hundred(that is a taller cart. and may need a spacer for a rega arm). I also have bought a few replacement styli's (hyperelliptical) for other brands that did well also.

Thanks for the responses everyone. I think I had read a post somewhere about the Denon not being a good match for the 640, hence the question. Will having to compensate with the amp volume degrade the sound quality at all or just annoy me having to remember to turn the volume down for ipod and CD play?

How would the AT120e compare to the AT440mla? Does anyone know if it is worth the 100.00 more in sound quality? Seems like a lot of people like the 440 with the Rega's.

Is there a big difference in the Ortofon red or blue, on the specs sheet they look pretty close. I figure there must be something about them to make a 100.00 difference, but can really tell.

The LP house brand look intriguing but I have never heard anything about them until now. Might be a good place to start.

I've also read good feedback about Grado, any suggestions for them?

If it makes a difference I listen to a wide variety of music. Rock, jazz, punk, soul, singer/songwriter, old country, hip hop and even little bit of classical.

Any other suggestions or comments are welcome! Thanks again!

My previous turntable was RP3 vith RB300. I had started with Denon DL-110, then upgraded with Benz Micro ACE H.

On the upper end of your budget you could get a pre-owned Dynavector 10x5, which is what I use. My previous cartridge was the Shure M97xE (great value), and the difference was crazy. The Dynavector would give you a real taste of high end rather than just "pretty good" sound.