Tru:
As I look at your system again and again, I would say that I like your amplification, and I don't think you should change that.
But perhaps, maybe you could tell me a little more about the Platinum Audio Reference 2's that you have in your audio system??? As I am not familiar with this speaker system, maybe you can tell me what kind of system this is. Is it a floor standing/full range system??? Or is it a bookshelf/stand mounted system like my KEF Reference 102s are??? And what is the driver complement of the Platinum Reference 2's???? Is this a two way or a three way system??? And in either case, what is the woofer size of the Platinums??? I am asking all of this because if you like the Platinums so much, then why are you so inclined to change them?? Depending on what you tell me about the Platinums, I am inclined to tell you to go ahead and keep them, and just spend your money on a good subwoofer instead. But now, if you have your heart on upgrading the speakers anyway, then I would say that you should look at the Wilson Cubs (like you have stated), and then mate them to a Wilson Subwoofer (if you want to spend the money to do so). Otherwise, if the Wilson Subwoofer is not your cup of tea, then there is always the Velodyne HGS-18. Also, at a risk of opening up another can of worms here, are you planning on upgrading the CD Player anytime soon????
Me??? In order to upgrade the bass response in my system also, then I am looking at either a pair of Aperion Audio SW-8 Powered Subs, or a used REL Strata II. If those two options are not feasible, then I may upgrade my speaker system as well. If I should decide to go down that road, then the speaker system that I have my eyes on would be either a used pair of Vandersteen 2Ci's or a new pair of Vandersteen 2Ce Signatures (with the endcaps finished in cherry or rosewood).
But anyway, look at the options that I have suggested for you, and then tell me what you think.
Thanks........
--Charles--