you could get away with a HEQ5 but ide be saying more like a NEQ6Pro they are somewhere around the 1400 - 1800 respectively.
For a start the standard eyepieces are not bad at all. use these untill you figure out what it is you want to look at and what the need you find that you have! this will stop you wasting your money.
My personal pref i wouldn't bother with the 6" as you can get a goto tracking 10" for the same price
here. more aperature than both for the same kind of pricing $1500. Just be aware that just because the tracking goto dobs are tracking and go to that doesn't make them good for astrophotography, for planetary it would be a good little combo with a 5x power mate and something similar to a DMK astro webcam.
I have meade series 5000 ep's they are quite nice but i will be the first to say im not a visual person im into astrophotography, that being said my 254 newt was once a 10" dobsonian and i still use the dobsonian base to store the OTA.
Good luck