Opinions about upgrade

Hello and welcome spitzer45,

     First, your Hegel h160 is a very good integrated amp that I'd think are a good match with the Proac D18s.  It may be a good match but I also understand the urge to upgrade or just be curious about what other speakers would sound like in your system.
     I often get this urge myself, whether it's speakers or other audio components, and my intention is not to discourage you but to suggest you find a local dealer that would allow you to audition some alternative speakers in your home and system. 
     It would help to know your budget, room size and music listening preferences(types of music and typical volume levels you listen at.).
     Just off the top of my head, I'd recommend considering the Kef LS50 as an affordable option and the Swiss Boenicke Audio W5 as a more expensive option.  These are both bookshelf type speakers and I think your current Proacs are floorstanders.  Do you have a preference?

Tim

I’d advise against Boenicke... 

what do you find lacking w current speakers ? changing flavors is easy...and random......improving takes a bit more work, but IMO worth the work...

I've had a bit of experience with the combination of Hegel and Proac, though different models (Hegel H200 and Proac Response D2s). To my ear, as good as both these components are, the combination tended a bit towards shrill which I ultimately found fatiguing. Can't fault the imaging or the detail, though. I think your Hegel amp would sound spectacularly good through a pair of Ryan R620s. I currently have their R610s (standmounts) and am enjoying them immensely. Superb balance, imaging, and all the detail the Proacs deliver without the shrillness. Of course tastes vary, and the variety of speakers out there is virtually unlimited, so I'm sure many others will want to share their opinions. (BTW, just to throw in my 2 cents worth, I'm not a big fan of Harbeths).