Headphones to Improve Upon AKG-Q701s

As some of you know I started a thread a week ago regarding Audeze LCD-2s. I have decided to expand my search to include other makes of open back, over ear, planer magnetic headphones at the MSRP of ~$1000. I am currently using a Schiit Vahalla and likely upgrade to the Vahalla 2 which, due to increased gain, will provide a wider range of headphones to be considered. I am considering other models. 

I currently use the AKG Q701s with the Vahalla and very much like the sonics. I am thinking that my quest for a Planar magnetic should result in an improvement over what I have now, specifically in soundstage/imaging. I am not a basshead, preferring quality over quantity in that frequency range, bass to midrange cohesiveness and a smooth top end are most desired.

Please provide suggestions and thoughts regarding those headphones I might consider, as I continue my own research.