Considering new amp - Mccormack

I've got the itch to upgrade my amps.

Currently I'm horizontally biamping with two modified Adcom GFA 555 II.

Rest of system as follows

B&W 803 Matrix SII - Recently refurbished
Sonic Frontiers SF1 Preamp
Music Fidelity A3 24 Dac
PS Audio P1000 power conditioner

Favorite Bands are:

Radiohead
Bon Iver
Fleet Foxes
Massive Attack

What I don't like about system: Raspy... especially with radiohead vocals.. The B&W combo with adcom and vocals of peter york are Harsh.

I'm considering the Mccormack amps, anything from the DNA .5's modified to mono's or DNA 2 or DNA 500?? Currently there is a DNA 2 Limited edition on Audiogon for about the same amount as the DNA 500.

My max budget is around $3k, but less would be nice, maybe I could get away with a single DNA .5 or DNA 125?

Any advice would be much appreciated.