What does better mean in terms of actual sound....I don't think the upgrade would bring that much. If you nit pic...sure it might do better but I would think there isn't much value in the upgrade. A cartridge change is in order however.
Tone arm upgrade
I'm currently using a Rega RB300 modded tonearm ( aftermarket wiring harness and counterweight). I'd like to consider a step up, have been keeping my eye open for a good condition used Linn Itok arm. Is this the right path or in the $1~$2k price range is I there another good alternative?