Dyanco Mk III's speaker suggestions

My first venture into tube gear is a pair of Dynaco Mk III's that I will be using with a McIntosh C-28 pre-amp, Sytemdek TT and Onkyo CD player.

I've done some research regarding speaker compatibility with tube amps and understand that a higher, mostly flat impedance curve is important.

I am interested in full range speakers that would not require the addition of subwoofer (although I have an Outlaw LFM-1 I can use if necessary).

My music tastes are all over the place from hard driving heavy hitting rock (Opeth) to mellow (Cowboy Junkies) and everything in between.

My budget is ~$1500 and I am OK with well cared for quality used speakers.

What would you recommend I look for/audition/consider?

Thanks in advance.