Nice, I have done Pandora's Star/Judas Unchained which I liked a lot, the Void trilogy which I liked but not a lot, and the Night's Dawn trilogy which I strongly disliked overall. Most of the time I dont have that kind of mixed experience with an author but I dont think not liking a series detracts from him in any way, it just wasnt a good fit for me. I'll have to check out Fallen Dragon when I'm done with Neal Asher's Brass Man.
I would heavily recommend the Culture series books by Iain M. Banks. They have a lot of advanced technology. Their societies are largely ship and space station based rather than on-the-ground cities but there is a huge variance across the series.
I would also recommend basically anything by Alistair Reynolds, but primarily the books in the Revelation Space series. Banks is probably a bit more accessible of an author but Reynolds is fantastic if you give him a chance. House of Suns is a good standalone novel outside the rev space series if you want a starting point.
Edit: also basically anything by Peter F. Hamilton. Fairly similar to Reynolds in scope but with quite a bit of raunchy stuff, whether that's a positive or a negative is your preference lol. Pandora's Star is where I'd recommend starting for him.
I didnt even know there was a 3rd or 4th. Same with Toy Story, I had no idea it went past 2.