spendor 3/5 vs era vs avi vs vienna acoustics hayd

i may violate the cardinal rule when making a purchase. i may take a big chance and make a mistake.

i am looking for a mini monitor and have narrowed it down to:

spendor 3/5, era ($600), avi neutron 4 and vienna acoustics haydn 2.

i will not be able to compare them and may not be able to listen to all of them.

i will have to rely on judgements from dealers, manufacturers and serious listeners. i may be able to use logic and "common" sense (hope i have it) to try to wade through all of the comments on these products.

ok: i am trying to find a speaker under $1500, decent bass response (flat to 60 hz), little cabinet resonance, somewhat laid back and a soft upper mid/lower treble response.

which of the 4, if any would be the best choice, and why ?

this would be a second speaker. my primary speakers are quad 63s and maggie 1.6 .

thanks for your help.