How important is the tonearm?

Well I'm going to be the odd one out here.
To me it's the cartridge that determines the sound which comes from the vinyl groove.
I've got 8 arms and 16 cartridges and most of those cartridges will sound their best in many of the arms (value from $460 to $10,000).
It's really only if you want one arm to go with many cartridges that the arm cost may (and it's a big may), equate to a more universal application...ie high compliance MM/MI and low compliance MC?

But many of the high-end current high-mass arms do NOT sound well with high compliance MM/MI cartridges.
If you believe that only low compliance MC cartridges qualify for the high-end, you are deluding yourself.

As Raul says....the Jelco is inexpensive.
It doesn't mean it's a bad arm. If you find a cartridge that you like and which is a good match, you don't have to pay more for an arm.

Davide,
We are all free to believe what we want.......even that the earth is flat or the sun revolves around the earth.
But please don't state that a suspended turntable is better than a non-suspended one as a fact.
To you it might seem true, yet that still positions it far from a 'fact'?

High school physics hardly qualifies you to teach.

To me, with a bit of university physics, a suspended turntable, no matter what frequency the suspension is tuned to, is a 'moving' turntable.
Once the turntable is 'moving', even if the arm is moving on the same suspended platform, all bets are off.
The geometrical relationships of the stylus to the vinyl groove are forever changing and the platter is almost never horizontal.

You appear to be stuck in an 80s timewarp with a 'Linn' induced mentality?
Thankfully analogue has moved on from this mind-bending 'sect' and a superficial search of all the high-end turntable introductions over the last 10 years would leave no doubt in your mind as to the view of the majority of current turntable designers.

But if you enjoy it........please continue to do so.

Oh dear oh dear.
The old 'tap' test again..........