Hiya!
As a small, compact buggy for normal sidewalks, urban use, and travels is for me the new Easywalker Miley absolutely suitable. It's so good-looking, handy, with so many cool accessories to opt for (I simply adore the steering wheel that you can attach on the bumper bar for the kid 😉) - and the Easywalker strollers are in general of very nice quality as well as driveability - so I am gonna say yes, go for it! A quality, good-looking small little buggy you're gonna make use of.
A compact, lightweight and high-quality model would, in my opinion, be also the Joolz Aer. It doesn't feature a full lay-flat (I don't know if you need it), and yeah, it is not the cheapest (but you say the price doesn't matter), but it's really a mechanically as well as design-wise a great one.
Lastly, I will also suggest looking at my last article about the Top ultra-compacts at the moment; maybe you'll find more inspiration 😉