I owned a VAC Phi 110/110, and VAC Musicbloc 160 monoblocks, and each benefitted by Purist Audio Dominus Ferrox power cords. I didn't find any other cords that made a difference as significant as the Purist Dominus. However, they're over your budget.
Since my ownership of the VAC amps, I have discovered Oyaide Tunami GPX power cords, which retail for about $350. I use four in my system. I can't say if they would be to your liking, but if I owned VAC amps again, I'd give these a try.
Since my ownership of the VAC amps, I have discovered Oyaide Tunami GPX power cords, which retail for about $350. I use four in my system. I can't say if they would be to your liking, but if I owned VAC amps again, I'd give these a try.