MMM very yummy turntable....
The Shure M92e is the most basic bottom of the line p-mount cartridge from Shure.
BUT - the body is the same as the M97xE, and some earlier higher end models like the M97HE. The difference between the bottom of the line version (M92e) and the top of the line versions (M111HE, M97HE) is mostly just the stylus.
You can therefore upgrade the M92e very very easily by simply swapping the stylus.
The best needle currently available for it is the Jico SAS.... but here is a wide collection of choices:
First the traditional p-mount format stylihttp://www.turntableneedles.com/search. ... &search=GO
Then the ones with the damping brush - back in the day, the top p-mount shure cartridges had the damping brush too (eg: M111HE, M105E) - with the damping brush styli you need an arm that has adjustable VTF which is not the case for all p-mount arms, but your SL-M3 is one of the very best... and is fully adjustable!http://www.turntableneedles.com/search. ... &search=GO
On a budget, fit the N97xE stylushttp://www.turntableneedles.com/Needle- ... _1479.html
or the Jico stylushttp://www.turntableneedles.com/M99E-SH ... _1448.html
(I have one of these it is very good...)
Going up the range, you can fit a line contact stylus - these basically get better high frequency response, with reduced wear on both stylus and record...http://www.turntableneedles.com/N110HE- ... _1450.html
The top of the line is the Jico SAS - the stylus is even finer with a longer line contact, so it makes contact with the groove along a vertical line rather than a spot, this spreads the tracking force across a wider area and also often reads both above an below the wear patches left by more ordinary styli on used records.
In addition (more importantly actually) the cantilever is made of boron - it is ultra light and rigid - lightness means less inertia and better high frequency response and tracking - this is a very very good stylus (at a price...)http://www.turntableneedles.com/JICO-SA ... _3953.html
Now looking at your AT450, this body is identical to the current AT92http://www.turntableneedles.com/search. ... &search=GO
Much like the Shure this has been sold under a wide range of differing names/numbers and even under different brands, the difference between them was only ever the styli...
Again you can go from basic conical through various grades of eliptical, to the line contact types:http://www.turntableneedles.com/search. ... &search=GO
With those two cartridges, you have substantial options - ranging from the ordinary to the extr-ordinary.... and there is something there for every budget and aspiration!
Hope this helps
bye for now