I wasn't trying to catch anyone out, just took a picture of the tonearm as you said.
I have a TD160 too, just about visible in the background. I've been running that as my main deck until the TD125 and SME cropped up with an offer too good to refuse.
I've got it all set up now, at least on a basic level and it's working a dream. The Shure cart that it came with is very warm and rich, good separation and in the mids, but really lacking in top end detail. I'd be interested to hear what carts you have used and which ones you liked and why.
This SME 3009 SII of yours is considered as a medium to high effective mass tonearm. So your choice of cartridge will first be trim down according to that. High compliant cartridge are in theory but most certainly in real also out the ideal matching league. Medium and teasing with low compliance cartridges should be a better fix mathematically at least that is. Then accordingly you either go for MC or MM ? And so on...
Actually I'm running only with my Denon DL-102 for the last 7 years. I collect original American soul 45's from the 6T's and 7T's mainly and that explains my orientation for this MONO cartridge/pick-up designed in 1962 for air-play broadcast playback. It's conical nude stylus won't provide the finest groove read but is the perfect match for my vintage 45's MONO groove. And it even reads decently without damages the STEREO records. This cartridge just suits my need, use and budget.
Not the most refined cartridge out there but with the rest of my phono set-up it is still allowing enough clarity and dynamic to display a 2-D image. In compensation the Denon DL-102 yet achieves to provide enough depth, details and balance in the highs, meds (bit less maybe) and lows. If the rest of my set-up would sound "warm" and "round" as some like to depict the vintage "tube" sound, I doubt very much my Denon DL-102 would sound as deep and dynamic as it is.
First I fitted this DL-102 on a SME 399 'Improved' S2. The counter weight pushed back to it's limit still managed to allow to play this cartridge. After a little while I started to convert this tonearm first into a detachable headshell one and gradually added effective mass here and there while doing other upgrades. Every tweak I did I gained into the cartridge groove read and likely the tonearm/cartridge resonance factor for an overall sound improvement.
So the choice of your future cartridge should be done with the trim down criteria as above, then on a budget and finally for what support of records and finally music genres it will be dedicated to read mainly. The rest can only be a guessing game as which will prove a good to better match with the rest of your phono set-up and it's ability to evolve/upgrade or not with fixings, tweaks and re-organistion in space. But what Shure cartridge is that you have on it now ?