Cartridge Selection

The Koetsu is way too stiff for that arm.The Lyra Delos is perfect as is the Clearaudio Talisman Gold. The Clearaudio is a bit more dynamic and it is also brighter. If you think you need a little more treble it is perfect. If your system treble is right I would go with the Lyra. I am a big fan of Ortofon cartridges but at this price point I think these two are a better value  price to performance. Up a little higher the Winfeld Ti takes over until you get to the megabuck cartridges. The best arm I know of for Koetsus is the 4 point 14. You need a heavier arm. The Stone bodied versions will go in a slightly lighter arm but they are very expensive. Never use a uni pivot  with a Koetsu. Moving iron cartridges can sound great but they are very sensitive to magnetic fields. DC motors generally work fine but if an AC 
motor is not well shielded you are going to get a hum which gets worse as the cartridge gets closer to the motor. Unless you have used one before and know you won't have a problem I would avoid them if you have AC motor. Cartridges are like ski boots once you use them there is no turning back.

I agree on the Koetsu.  the compliance on a 3D arm is marginal at about 13hz resonance which is not the best.  you could use the sound smith ezmount screws and add some weight (probably the brass ones) to help the Koetsu along.  I have to respectfully disagree about the Moving Iron carts shielding on the SS is very good and people do not have issues with them like they do with the Grados that are not shielded.

@gareents,

I have the same tt (mine is an SE), and just got my SS Sussurro MkII (@40% off) broken in and it sounds fantastic! No hum at all. The more than fair re-tipping charge on the SS is a major consideration.

BTW, if you are using a uni-pivot arm, have you tried the dual pivot upgrade? If not, I'd recommend getting that first.

@slaw 

Yes, I do have the dual pivot installed.