The problem with the K series is that it's no longer supported. It was made by Audio-Technica, it was supposedly based on the AT 95e which is available from LP Gear (www.lpgear.com).
Currently, Linn is pushing the Linn Adikt, which is said to be essentially a Goldring 10 series cartridge. Thus, you could consider either the Adikt, or a Goldring. I'd lean to the Goldring--there are more stylus choices, plus (I think) lower prices. But, the Adikt is easier to mount.
A Grado might work. There is the possibility of hum, but some have used this combination.
I've also heard of people using Shure cartridges. In fact, there was an Axis on Audiogon a while back that had the M97.