Atticus

Zmf atrium is not a super bassy headphone to my ears. If you want bass in the zmf line id go with atticus or eikon(first for mid bass second for sub, i personally prefer the first with eq over the second even with subbass). Caldera also has good bass, but id also not call it super bassy headphone.

Having acess to demo lots of models might almost be a double edged sword - I live too far away from any major cities to have had that acess - I bought my ZMF Eikon blind, but having read and researched a lot and decided they matched my preferred sounds (punchy bass, clarity, warm overall tone) and I have been super happy with them. Lots of people on the ZMF head-fi threads talk about always being pleasantly surprised by both the Eikon and it's brother the Atticus - maybe see if you can try one of them out somewhere? I have been continually impressed with both ZMF's products and their customer service - IMO they are one of the top headphone brands across the board.