Current TT is a Denon 100th Anniversary with a 110 Anniversary MC cart, but may eventually upgrade them as well.
If your phono is set up correctly you should not have problems with rumble. My speakers are flat to 20Hz and my preamp (including phono) has bandwidth to 2Hz. Yet rumble isn't a problem.
If your cartridge has compliance too high for the mass of the arm/cartridge combination, you will get excessive low frequency motion on the cantilever as the cartridge tracks the LP- its nothing to do with the turntable unless the 'table has a serious problem!
The rumble filter will introduce a low frequency pole that you will notice (if you still have the Betas) as a loss of bass impact and extension. I'm of the opinion that its better to solve the problem than put a band-aid on it that degrades the sound. Put another way you need either a lower mass tonearm or a lower compliance cartridge.