"Second, your Basik Plus is a low mass tonearm"
Doug, I'm not sure I agree with this.
To Calgarian...
Is the arm the Basik LVX+? The LVX has an effective mass of 12.5 grams, according to the data on Vinyl Engine and Cartidgedb. The LVX+ has (as I understand it) a fixed headshell in contrast, so I would expect it's mass to be on the order of 11.5 grams or so. This puts the range of catridge masses at about 8-12 grams (with mounting hardware), and compliance from about 10-19, to put the combination with the LVX+ at an acceptable resonance point. (You could go with a much lighter or heavier cart but that would skew the needed compliance into a very narrow range.)
So strictly from a matching POV all the carts you have listed should work (including the 103R mentioned by Downunder). The GCPH has a maximum gain of 60, so you may want to reconsider the Karat very carefully. It has a very low output (.23mV or .2mV depending on the model) and depending on the total gain of your system the GCPH may not be able to drive it high enough.
I'm not sure how the Copland and YBA sound together, but I do have the 103R and can agree with Downunder and Cello. It plays well past its price point. It s non-fatiguing without being "dull" in any way, and as musical as all get out. It is not the most transparent cart ever, and it loses to more advanced stylii in dragging the last little bit of detail out of the groove. But it is just a great sounding cart.
Now, having said all this I will agree with Doug in that, if you're going to upgrade anyway you should probably do it before getting a new cart (assuming the K9 is still usable).
Doug, I'm not sure I agree with this.
To Calgarian...
Is the arm the Basik LVX+? The LVX has an effective mass of 12.5 grams, according to the data on Vinyl Engine and Cartidgedb. The LVX+ has (as I understand it) a fixed headshell in contrast, so I would expect it's mass to be on the order of 11.5 grams or so. This puts the range of catridge masses at about 8-12 grams (with mounting hardware), and compliance from about 10-19, to put the combination with the LVX+ at an acceptable resonance point. (You could go with a much lighter or heavier cart but that would skew the needed compliance into a very narrow range.)
So strictly from a matching POV all the carts you have listed should work (including the 103R mentioned by Downunder). The GCPH has a maximum gain of 60, so you may want to reconsider the Karat very carefully. It has a very low output (.23mV or .2mV depending on the model) and depending on the total gain of your system the GCPH may not be able to drive it high enough.
I'm not sure how the Copland and YBA sound together, but I do have the 103R and can agree with Downunder and Cello. It plays well past its price point. It s non-fatiguing without being "dull" in any way, and as musical as all get out. It is not the most transparent cart ever, and it loses to more advanced stylii in dragging the last little bit of detail out of the groove. But it is just a great sounding cart.
Now, having said all this I will agree with Doug in that, if you're going to upgrade anyway you should probably do it before getting a new cart (assuming the K9 is still usable).