Goto motor or new telescope with goto build in?

[Triniton91]

Greetings and goodevening, im totally new here and id like to ask for some advice regarding the situation im in setting up my astrophotography package.

A few years ago i got into the hobby of photographing the nightsky and slowly rolled into getting a telescope to try and help me with this.
I ended up purchasing the besser 102/1000mm refractor because i didnt have that much knowhow of telescopes at the time (it said DEEP SKY so i was sold). the telescope came with a EQ-5/EXOS2 mount, without the trackingmotor/goto system.
Now ive tried doing manual tracking or taking short exposures and stack those but i know i could be getting alot better results if i had the means to track what im looking at for longer exposures, and convenience sake.

i was eyeballing the goto system from bresser a few years ago when they were still around 350/400 euros, hoping theyd drop in price over time but now the goto system costs 520 euros.

Wich to my judgement kind of lands me in a fork in the road where i can either 
A: buy a smaller telescope that might be abit more practical then the 1000mm tube im walking around with, that already has a goto system with equatorial mount around the price range of the motor or abit above.
B: buy the goto system for the mount that i already have for 520 euros, and maybe look for a smaller reflector at a later point, i dont hate the 1000mm one that i have now, its just that through google searches i see a couple people on forums saying starting out with a 1000mm is not a good idea because of dificulty, or that a 102/1000mm refractor is not good for imaging to begin with.

Or a new option C i found today wich is this motor for 150 euros a:  EQ-5-motorset RA and DEC, with ST4 autoguider interface
 https://www.astroshop.be/motoren-kits/skywatcher-eq-5-motorset-ra-en-dec-met-st4-autoguider-interface/p,46068?utm_medium=cpc&utm_term=46068&utm_campaign=2405&utm_source=froogle-nl&gclid=CjwKCAjw9IayBhBJEiwAVuc3foiUVqwHdUnfMnwarMTBgQTdOy34d5JNdI5wgG_-RNTm4Rm3M5VVQxoCSKIQAvD_BwE&utm_content=#specifications

But im not sure about this one because i cant find much info on the system, would this allow me to hook it up to a laptop and use software like APT together with my nikon dslr to track the nightsky properly or would i need a different motor system to achieve this?

I might be asking a stupid obvious question here but i dont really have someone with alot of knowledge on this that i can ask so im trying here :)

[Cornelius Varley]

Option c doesn't provide goto functions, only auto guiding through the ST4 port.

[ollypenrice]

You've already bought the wrong kit once, as most of us did when we started. It would be a shame to do so a second time, and upgrading an EQ5 as you suggest would still not leave you with a fully satisfactory astrphotographic mount. I would be looking at buying an HEQ5 in the knowledge that this will work for you.

Think what we are asking of our mounts: we want them to track the sky with a precision amounting to an error no larger than half a pixel at the imaging camera. That works out to about one part in 2 million. When you have this, your mount's tracking is effectively perfect, in that it improving it wouldn't make a visible difference. If you have an autoguided HEQ5 this will be possible at reasonable resolution. Long focal lengths/very fine image scales would need slightly better but I would worry about that later.

HEQ5 and NEQ6 mounts come up on the used markets.

Olly

[Earl]

Purchase the very best mount you can afford it is in reality a longer term saving.

[Cosmic Geoff]

It appears that you bought the wrong telescope and the wrong mount.  The conventional choice would be a f5 ED refractor and a HEQ5 (or bigger) mount.  This will inevitably cost a wad of money.  If that is not where you want to go, consider cheaper and wider field options, eg a DSLR and lenses on a tracker mount.