Worth the $$ to upgrade my tonearm?

The equipment I have now is:
McIntosh. MC275 amp
McIntosh C2200 Pre Amp
McIntosh MVP 891 DVD Player

Sansui TU-X1 Am/Fm tuner

AudioQuest Niagara 5000

Transparent Cables

JA Mitchell turntable with an Ortofon 2M Cartidge
Rega entry level arm ( not sure which one or its number, RB220 maybe? Rewired with Cardas wires) Arm was taken from a Rega table that was scraped.

Joesph Audio Pulsar speakers
REI small subwoofer

All on a Billy Bags. stand.
Room size is: 16' long X14' wide ( our small apartment living room)

The above equipment came one at a time over the years, usually when something went wrong and I had enough money to replace it. Sunday has become vinyl , record day, with any music you can think of ( except rap).

If I replace my tonearm with a $1500 to $2000 Rega tone arm (RB2000?) will there be an auditable notice in the positive? Or should I forget it and buy more records with the money?
THANKS for reading this and your help! Paul