I happen to have heard all three models in different set up at a friend audio shop. I would say the RS20 is the better buy,it has better detail than the RS10 and with a little pinch of colour to the sound. The RS30 has better extention at the top and a little closer to the neutral side. Also take note that the current models has the same conical body as the better models (The previous series has T-body front view).
All three cartridges has extremely smooth and quiet,so take you pick. They are all excellent cartridges and I think you should be able find one that suit you system.
All three cartridges has extremely smooth and quiet,so take you pick. They are all excellent cartridges and I think you should be able find one that suit you system.