Looking for not too expensive Turntable

Don’t now about jitter. May be you are hearing pitch variations due to the flexibility of the belt - wow and flutter. DD is better technology. Pioneer DD is actually very good in the late 70’s.

Denon DP80 can "beat" SP10 Mk2 by a small margin.  Can be found for $600 to $900.  (I owned them both, both in custom slate plinths, ran them side by side in my system. End of editorial.)

What you may have heard from your un-named DD turntable may have been motor cogging, but it was definitely not "jitter".  Jitter has a very specific definition related to digital audio technology.  No need to muddy the water by misusing terms.  Since you don't name the offending DD turntable, it is difficult to comment, but your experience with one particular sample does not prove that you would not enjoy some other refurbished vintage Japanese DD turntable, like either the SP10Mk2 or the Denon DP80 or any of several lesser models; other than the Technics brand, they are all relative bargains in today's market.  By this I mean that the cost is a fraction of what you have to pay for similar performance from a new belt-drive.  And then there's also the Lenco L75, for the biggest possible bang for the buck. Straight out of the box, the Lenco is excellent, but to get the most out of it, the Lenco is for a person who likes to tinker.

I'm very happy with an Audio Technica LP AT5 I bought. Changed the factory cartridge for an Orfoton Blue and substituted the included rubber mat for an acrylic one. Also hooked it up with my higher end interconnects. 

It sounds really good for a $450 - $500 TT

I can recommend any of the vintage Empire TT's. Belt drive and a high torque motor. I own three - with a fourth on the way!