Bona vespre Miguel!
I've heard that Lisbon is lovely, and I'd love to visit one day soon. Barcelona itself is relatively small for being a city, so I'd like to see what a mini-Barna is like :-)
I'm British, myself, but have lived here long enough to call it home. We have much better weather for stargazing down here in southern Europe, except for in the summer when it looks like someone's cooking the Earth's atmosphere all night! :-D
I saw that post on SGL about the GSO optics when I was researching purchasing mine. The post is five years old now, so I gave it less weight when making my decision. I'm afraid that I haven't used an equivalent telescope to be able to make a comparison, but hopefully someone else here can help answer that question.
If you don't have anything similar to compare it to, then I imagine you'll be as happy with it as I am with mine, but if you sit it next to a reflector with premium optics then you might be less impressed.
The 12" GSO deluxe is €855, which on one hand is a lot more than you initially wanted to pay, but on the other hand it's the best price-to-aperture ratio you're going to find, I think.
At €1.89 per square inch, only the 10" and 12" basic GSOs are cheaper (€1.52/in² & €1.55/in² respectively), and they lack the aforementioned bundled goodies.
If your budget can stretch to it and your place in the country has the space to put it then I would go for it.
However, do double-check that it'll fit in your car (you mentioned driving it a couple of kilometers) as the 12" OTA is 25cm longer than the 10" and the 8".
And if you think it's a bit more than you really want to pay, then a 10" or even 8" will still show you fantastic sights - an 8" will show you a whole lot more from the country than I'll ever see from the city with my 10"!
Finally, just to confuse things a little bit more than they already are: something that the 8" has going for it over the 10" and the 12" is that it has a slightly longer focal length, which means that less expensive eyepieces will perform better at the edges of the FoV than they do in the F/5 scopes.
Also, it would be remiss of me to not mention the few small negative issues I found with my GSO deluxe 10":
As happy as I am with telescope as a package, I do have to say that the 30mm eyepiece gets quite annoying, and the game of "is it a galaxy? is it a double star? Oh no, it was just the horrible edges of this eyepiece" gets old quickly. I'm looking to replace that eyepiece. I've already replaced the bundled 9mm plössl with an ES82° 8.8mm, which I picked up on sale from my local astronomy shop. But I kept the plössl for when kids are using it - I've found it's a lot easier for them to get a good eye position with that than with the 82° extra wide eyepiece.
Another negative of the GSO is the handle for the mount. Mine came with some strange little holders for the bolts which pushed into the chipboard with small metal teeth, and the whole thing promptly came off in my hand two minutes later when I attempted to use the handle. That was slightly disappointing, but I haven't really missed the mount not having a handle.
The finder isn't a right-angled correct image (RACI) finder but a straight-through one, which means you shift position to use it (often off your chair and onto the ground on your knees, and then back up again once you've found what you're after).
The fan's power socket is small brittle plastic, which I broke on the second or third time I used the telescope. This is more my fault than GSO's, sure, but the flimsy design didn't help.
Edited by AaronF, 14 October 2019 - 05:59 PM.