Icorem,
Dynamic compliance (cu) is the one to consider with arm matching. Standard calculations are with cu measured at 10Hz. Many Japanese companies measure at 100Hz so these must be converted. A 100Hz cu of 6.5 (AT95) = 15cu at 10Hz. A 100Hz cu of 10 (150MLX) = 18cu.
Conversion isn't straightforward. 100Hz cu is actually a measure of tracking ability at 100Hz, not compliance. The above figures have been verified for specific carts. VTF usually coincides with compliance. In this case recommended VTF of 1.7 to 2.25g should match up nicely.
This is not written in stone and results might vary. A high compliance cart on a heavy arm will have resonant frequency below the recommended range of 8 to 12Hz which makes it more susceptible to low frequency mechanical and acoustic feedback, woofer pumping and record warp problems. This is alleviated somewhat by a stable setup, high quality arm bearings, and arm damping. Either the MP200 or the AT7V should work out nicely.
Capacitance load is your preamp capacitance + cables + internal arm wire. If your phono is 100pF you should be okay with an AT and most supplied wires - they average around 100pF. If you have an audiofool tonearm cable, who knows? Nagaoka actually recommends 100pF load, but I suspect this is for a preamp setting.
The AT has a balanced sound and I think has more detail than the MP200. Even though the 200 has a boron cantilever the tip is .4 x .7. The 7V is sharper, nude .2 x .7 w/tapered aluminum cantilever. My experience with Nagaoka is limited, but I know the AT is a excellent cart, reminiscent of a Signet TK5Ea. That's what I recommend.
Regards,
