As a fellow JVC QL-Y5F owner.....
I chose the Y5f as my 2nd table because I wanted something different.
My first table is a Revox Linear tracking B795... Linear Tracking, Direct Drive, Suspended, Ultra light arm (4g)
I wanted a damped (for flexibility with many differently compliant cartridges), pivoted (cos its different to Linear..!), s-arm with exchangeable headshells (because I wanted to experiment with different cartridges and that made my life easier).
Along the way, I filled the JVC plinth with plasticine, swapped the feet, placed it on an isolated rack.... and have collected a range of different weight headshells and counterweights so I can "tune" the arm mass for best results with different cartridges before involving the damping.
The Revox (like some other turntables) is great for set and forget playing - but changing cartridges is a serious pain with that design.
On the other hand it is brilliant with ultra high compliance designs suited to the 4g arm.
My suggestion is:
1) Forget about belt vs direct drive vs idler - a well implemented drive system is important, and one that does what it is supposed to do.... there are lots of top end tables from yesteryear that do the job very very well in each category - the drive system is not a good selection criteria....
2) Given your wooden floor and the likelihood of floor vibrations working their way to the turntable it should be damped/isolated - this could be by being sprung, or by being on damped feet (like many unsprung turntables) - the spring types do tend to a bit more immunity from external vibration.
The plasticine I added into the JVC plinth helped it quite a bit - added mass but also vibration damping .... without springing...
3) A real criteria for choice would be the arm - choose something different - that way you can experiment with the part of the system that really makes a substantive sonic difference - your current arm is mid mass - you might want to go ultra light - and try out high compliance designs - or perhaps look for something with a linear tracking arm.
4) experiment with differing cartridges.
As an aside the JVC were it new today would be selling in the $1500 to $2500 bracket.... and properly set up that is its current competition too.
Any other turntable you want to try out needs to be a fairly serious TT to give the JVC a run for its money.... For good value with a different approach investigate the JVC's competitors when it was new - TT's from that period often go for a song (less than $100) even if they would be selling for 10x that amount if they were new. It is a buyers market.
The Revox I own was in a shootout in an Australian magasine alongside the JVC in the early 80's.... They are very different but both high quality tables.
Vive la difference!
Another comment - one of the fantastic things about the JVC is how versatile it is.... the counterweight thread is the same as the very common Technics SL1200 series - this means you can easily adjust arm mass up or down by around 30% or maybe more at minimal cost. I have counterweights at 147g, 110g, 97g, 85g - and am still hunting for a 70g one
Headshells are available in all weights between 5.5g (my lightest) up to 18g (and perhaps more).
So you have an arm that can go from an effective mass (including cartridge and fixings) of 32g down to an effective mass of 15g. (also including cartridge and fixings)
That means for a resonant frequency of 10Hz you can go from an 8cu cartridge (arm at 32g) to a 17cu cartridge (arm at 15g)
If you widen the permissible resonant frequency to 7hz-13hz this takes you to cartridge cu's from 34 to 5.
The damping facilitates the wider range of permissible resonant frequencies...
Not a lot of arms or tables that have this kind of flexibility.... and there are very very few cartridges that fall outside of the JVC's arm parameters.
In any case - if you opt for a different table to try out, don't get rid of the JVC.... just get a 2nd table that is as different as possible - so you can get to know how the other half lives (so to speak.)
bye for now
David