Warm Sounding Power Amp or MHDT Havana DAC?

My system is a little bright and I'd like opinions on what is the best way to warm up the sound. I have MB Quart QLS-830 floorstanders powered by a Marantz SR5002 AVR. In general I like the sound...just a little crispy on top. I'd like to keep the AVR functionality, as I do occasionally watch movies with the system, so I was thinking about adding a power amp or DAC.

I've read great things about the MHDT Havana DAC and also heard that B&K power amps are warm and tubey. I'm wondering which would have a bigger/better impact on my system's sound, or if there are better options. I'd like to keep it under $1000.

Thanks a lot!