Two very nice cartridges!
Both currently undervalued
Stanton/Pickering have dropped out of the audiophile market - but there are a number of well regarded stylihttp://www.lpgear.com/product/PICKSXSV3000.htmlhttp://www.turntableneedles.com/search. ... &search=GO
The Signet is a close relative of the current AT150ea
and you can still get styli for it:http://www.turntableneedles.com/Signet- ... _1842.html
A more expensive alternative for either of these (and a very high performance alternative) - is to send the cartridge with the old broken/worn stylus to one of the retippers - for $150, they will fit a new cantilever, suspension and needle.
Reviews of this type of treatment usually report it sounding better than new.
on a tight budget, and knowing you like the signet, the new needle for the MR5e is a safe bet.
The Pickering has a different voicing - so if you want something a little different for a change - go down that path - the vividline styli also have a good reputation, and should be a good match for your arm/table.
For an MC, I would look for one of the higher compliance designs as that seems to be a relatively light arm - so something like a Dynavector perhaps.
You could also look at something from the Grado range - even the lowly Prestige series can be upgraded to very high performance with the right stylus (MCZ, 8MZ, TLZ) - and look at the Cartridgeman's Musicmaker cartridges for what sort of potential the prestige series have! (competes with high end MC designs)
I would expect a Grado to match well with your arm/TT too.
Bye for now