I don't go for gloss and glitter, preferring to choose by sound, so I'm probably not qualified to offer advice. I smile when I hear someone compliment someone's uke because it looks nice, even (if) it doesn't sound good. But l know you'd have a better (more discerning) ear than most buyers.
My go-to 4-string concert is a Fluke by Flea Market Music (the same Jim Beloff who writes those uke books we talked about). Some folks are turned off by the polypropelene body, painted wood top, and strange shape, but it has a great tone. And those pheg tuners never move. Not sure if they offer it with a pre-amp, but I don't play my stringed instruments through an amplifier (another story).
A decent choice for an all-wood concert would be an Islander, which is available with electronics: The same company as the expensive Kanile'a, but they make the Islander in China and it sells for around $250. One caveat, I've only played/listened to their concert. The owner of Kanile'a once put one of his $2K/$2.5K ukes in my hands, but I was scared I'd have an accident with it.
I've played other expensive ukes, including a Martin (loaned by a friend), but I couldn't justify spending that much.
One suggestion for whichever concert you buy, consider changing out the g string for a 'low g'. I haven't done so, but it makes a more mellow sound on the multiple ones I've heard.
I'm partial to Kala, but only for the models I own. I played and listened to them quite a bit, and took along someone esle for an opinion, before buying.