Good amp match for vinatge Vandersteen 2C's?

I have Vandersteen 2CE signatures (and used to have 2CE's). I had a Conrad Johnson PV-10 with an Adcom 555 (then replaced the amp with a Classe 15 - big improvement). I now have the Emotiva USP-1 pre-amp (with a Yaqin tube buffer between the pre and amp). Sounds very good, and definitley offsets the "softness" of the Vandy's.

My experience in comparing the signatures to the 2 Ce's I used to have is that they are just a little better all the way around. Similar sound, but better in detail (both bass and treble), higher highs and lower lows. They still have the same overall sound character. I only upgraded because mine had a damaged speaker and the outside cloth was a little tired, and I had no good way to repair them. I don't necessarily think it would be worth hundreds of dollars to upgrade if your original 2ce's are in excellent shape...