I have managed to get very good tracking, lack of backlash etc on both a HEQ5 and EQ6 as they both have belt drives and much beefier stepper motors that eliminate the spur cut gearboxs. I think that these gearboxes are what let them down.
My first mount a HEQ5 had random 'microjumps' that only showed up at long focal lengths ie 1800mm. I replaced the motors and gearboxes with Astromeccanica motors with belt drives. The difference was amazing.
I am Happy with my EQ6 with belt drives and Mel Bartels system (see pic below). But I should have bit the bullet and gone for a 'quality' mount from day one in hindsight.
At least the cheaper mounts give you experience and if you are really still keen just simply upgrade as then you should have some idea of what you need rather than what you want.
Here is a pic of Omega Centauri taken with the Tal200k at 1800mm f/9 on the EQ6.
http://avandonkbl.bigblog.com.au/dat...1017145329.jpg
Bert