Just out of interest how much do those 'serious monitors' cost? I didn't realise Mayer were very well known in the recording side of things.. more for live sound.
Also what makes the compression/horn tweeters so much more accurate? Whenever I have heard them, admittedly mainly in P.A. systems (though some very pricy ones) they sound absolutely horrid and lacking in detail.
To get a perspective on your views, what is your taste in speakers 3D? Personally I like active systems, soft domes and transmission lines, making something like the PMC BB5-A a dream speaker for me!