I would like to suggest Aric Audio. The two piece pre in my system is his Motherlode II. I find it an end game piece. http://aricaudio.com/
I have no affiliation,just a very satisfied customer.
My Chartwells are set up in my small listening room. 9'x13'x 8'. Currently I am driving them with a pair of Monarchy Audio SM70mkII's class A amps with very good results. I will also swap in my First Watt F5,also with very good results. Everything is run through an Aric Audio Unlimited tube preamp.
I recently acquired a pair of the LS3/5's. I am absolutely in love with them. I have not had the chance to hear any other LS3/5a's,new or originals. My only point of reference is my Spendor S3/5's. I find the Spendors to be wonderful speakers. However,the Graham Chartwells are a step above .