I have had an SL1210 M5G for about a year now. I've used it with a Shure M97xE with occasional switches to an Ortofon OM10, followed by an upgrade to a Denon DL-160 mounted on a Sumiko shell. Three months later I added the KAB fluid damper and everything got that much better.
The Sumiko headshell is a good investment regardless. The extra weight improves the mass/compliance ratio with the Denon and most modern carts, it's more rigid and non-resonant, the lead wires and clips worth $20 alone, and it has adjustable azimuth, which helps dial in soundstage and imaging.
The Denons are noticeably better than the Shure M97xE--more linear, better frequency extension at both ends, tighter bass, cleaner treble, and smoother yet more dynamic everywhere. Add the KAB fluid damper and you can "hear the room." Denon+Sumiko headshell+fluid damper has turned my Technics into a 3D sonic virtual reality machine.
On top of all that, the Technics tonearm plus fluid damper will easily track a record with 1/2" warp fluctuations in the outer track. Nice to know if you're a thrift shop bottom feeder like me.
Concerning the rising prices on the AT440MLa, the sub-$100 price was a sale price on a $240 cart. LP gear still offers it at $99.95 at
http://www.lpgear.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=LG&Product_Code=ATC05&Category_Code=A3.