Best upgradable system components for under $6K


Hello All,

I plan on upgrading my system with components that I can live with in the short term and the long term (hopefully so I don't have to keep upgrading components as I upgrade my speakers).

I currently have an NAD 356BEE integrated and while it is entry level I must admit it sounds very nice. My room is 14'8" by 20'4" and I currently have a pair of Legacy Classics (not Classic HD). My goal is to make my next big purchase on components in the $6k or less range but I would like to make it a once and for all purchase. In other words I'm looking for something I can live with for 15-20 years without worrying about upgrading.

I would prefer to stay solid state and don't mind having an integrated or pairing separates. New or used also doesn't matter as long as it is a great bang for the bucks. My ultimate goal is to one day be driving a pair of Acoustic Zen Crescendo or Vandersteen Quattro speakers. A 200wpc + consideration would be preferred but I’m flexible on that too lol.

Finally my music selection is a bit diverse. I like jazz, soft rock and new age. Some of my favorites are Dave Matthews, John Mayer, the Wallflowers and John Tesh. I value your opinions highly and would love the community's input on the best component upgrades for my $6k budget.
xerotrace
Thank you everyone for you input. I think I need to do some auditioning with the Vandys to see how they sound to my ears. The Ayre sounds like a leading contender with my speaker choice so I will certainly give those a listen.
Yes, do your homework. I couldn’t say what i would do of I had your budget. I know I would take advantage of the fact that I currently have a satisfying system and take my time, buy each component for the long haul and with an end plan that allows for synergy toward my listening preferences. I have enjoyed your thread. Good luck and please keep us posted.
The Exemplar Audio Exception integrated is an amazing component. Once again you would have to spend big $$$$$ to better it. I just posted a piece about the components I own from Exemplar. I have owned lots of gear from lots of companies and this is the most musical gear I have owned. Great gear for reasonable money. Highly recommended.
Thanks again for all the feedback. In researching my options I stumbled upon some reviews of Class D amps. I know NAD makes one that is pretty reasonably priced (around $3K new) as do some other manufacturers. I think the technology is still new (from what I can gather) but should this be a consideration for me? Would it be a problem to match a Class D amp with the Class B amp that is built into the Vandy Quatro's?

What are the advantages of the different class amps? Do I need to have a different class amp for a speaker that is completely passive (like the AZ Crescendos) vs. a speaker that is partially passive (like the Vandy's)?
While this technology is changing and improving at an impressive rate, let me recommend something involving DSP. Recently got a DEQX HDP-4 and it has transformed the sound of my system. Replaces my DAC and preamp, and the speaker/room correction functions are astounding.