Speaker Suggestion for Audio Research VSi75

I've been itching to get back to tubes and was able to pick up a like new Audio Research VSi75 integrated.

I'm not shopping for a set of speakers that pair well with this amp and ideally looking at the used market to optimize my roi. This makes auditions challenging so looking for any recommendations. 

I'm looking for a smaller set of towers for an office space (room is about 14 x 20). I'd like some nice bottom end, silky mid range and highs.

I'd like to stay around $5000 but have some flexibility.

My local dealer is recommending some trade in Wilson Audio Sophias 1.....but would love to hear thoughts from folks who might have experience in this config.