I’m looking for an sleek integrated amp under $15k

@jacobsdad2000 lol indeed.  My favorite was @soix link which literally has the word sleek in the description only for OP to neg anyway.  In his defense the Divialet is ugly.  Nobody does minimalist as well as Naim. 

Just get this Lyndorf TDAI-3400 

Lyngdorf TDAI-3400 - Lyngdorf Audio (steinwaylyngdorf.com)

@aj523 a couple of folks have mentioned Lyngdorf. You should check out the review link @hilde45 posted above.

You have good taste in the Naim Nova. The only thing it’s gonna give you that the Lyngdorf TDAI 3400 won’t is the cool color display, though, and the sexy feel of the volume knob. Although the volume knob on the Lyngdorf is very cool to. It has a nice action. As far as sleekness goes, it’s a complete toss up, imo. I’m kind of into design, personally, and I think that the aesthetic of the Lyngdorf is spot on.

What you lose out on in the color display dept is kind of dwarfed by the other advantages, though, in my opinion. The Room control software is second to none. I read every review I could get my hands on before I scored my 2170, which is the middle brother, between the 3400 and the 1120, and that’s kinda what they all say.

Room Perfect took me every bit of :20 to do, and I’m here to tell you, you will lose your room issues on the spot. And that could possibly transform the way you get to enjoy it.

If you get it brand new, and you get all of the available modules, you’ll still be under ten grand. And, dude, the performance. Had to say it that way to make the point. I’m not saying it will perform better than the Naim, as far as musicality is concerned. And the Naim will have that sweet house sound, but the versatility of the 3400 is really a very Big Bang for the buck.
 

If it’s realism you crave in your music, this piece of equipment is a one box solution that drill that kind of rivals them all in overall performance when you consider both the adaptability and the room control. I don’t know if rival is the right word, but it’s certainly up there at the very top.

@perkadin  Soul Note and LFE, and they sound good too! Some of the suggestions are just laughable when it come to sound and imaging. Not saying that of Naim. 

"Sleek" is a visual description and will be very subjective so in that area you'll just have to find something that is visually appealing to you that meets your other preferences. But as the football guy says, Mola Mola beats everything unless you want to really increase your price range. Funny how so many things supposedly sound better when they're more expensive. Silly humans and their expectation bias.