1musiclover
To answer your initial question, I think what you need is a medium/heavy cartridge with medium compliance. Since your SME 309 has an effective mass of 9.5g, a typical ZYX cartridge is around 5g + another 4g with the added silver base which is recommended and required if you decide on a ZYX with your SME. You will need the added weight for a proper match.
The end result is 9.5g (arm) + 9g ( 5g. ZYX + 4g. silver base) = 18.5g - ZYX compliance is 15 x 10(-6) cm/dyne (horizontal) / 12 x 10(-6) cm/dyne (vertical). This is a great match.
The Dynavector will be a poor match (at least on paper).
just my 2 cents