Best option for Amp upgrade...

I have a McCormack DNA 500 that I like.  I'm considering spending about $4k to have it modded by Steve McCormack (SMC).  Alternatively, I could sell the DNA 500 for about $3k and have $7k to spend on a used (or new) solid state amp.  I'm inviting opinions on which would give me the best bang for the buck.  I'm hoping to achieve greater resolution and detail.  Bass control is not an issue!  Here is the rest of my system:

Pre-amp - CJ ET3-SE
Speakers - Rockport Mira II with REL G2 sub
Source - Aurender A10
Cabling - Transparent Ultra MM2 speaker, Gen 5 Super interconnects, Reference power cords (mostly) 

If you suggest a new amp, I'd be interested in your recommendations.  Thanks!