The Zen will serve you well with any kind of music. Truth be told I'm a big classic rock, hard rock, death metal fan and these 2 watts take me anywhere I wish to go. Their synergy with my Hawthorne SSIs is really special, and their match with Omegas are completely unquestioned.
Re: cabling... well, I just love cables. And I invest as much as I possibly can in them. Some think that's crazy, but I think it's important. Story about Blue Jeans.... my buddy has a Decware Rachael and some Tekton M-Lores with a VPI Scout Jr. front end. He bought some Grover Huffman interconnects to try out in place of his Blue Jeans, put them in and within 5 mins said "these Blue Jeans are a pile of garbage". He's very diplomatic.
He ended up replacing the Blue Jean SC with Grover as well. One night, before he picked up the Grover I brought over my Triode Wire Labs American SC to swap in, and the change was the largest audible improvement I've ever heard from a cable swap. Just sayin'.
I run mostly TWL in my setup, including all my power cords and interconnects, with some vintage Western Electric 16ga wire for speaker cables and a High Fidelity Cable CT-1E for digital. But there are many other great cables out there and I'd encourage you, at your own pace and budget, to explore some higher-end options. Sort your equipment first though. I do have a regret, and that's diving into cables before I even knew what my core components would be. I've bought Kimber Kable, Clear Day, Grover Huffman, High Fidelity Cable, Crystal Cable, Shunyata, Black Cat, Mapleshade, JW Audio, Coincident, Straight Wire and Triode Wire Labs cables at some point in my journey. I've auditioned ZenWave Audio, Sablon, Synergistic Research, Snake River Audio and Stereolab as well. If you're experimenting with DACs, amp/speaker combos, front end equipment etc., just get a complete loom of moderately priced cables or use whatever you currently have and search more heavily when you're satisfied with that part. There are some great DIY options as well, if you're industrious. I'm not so industrious
Don't ignore power cables or good conditioning, either, and if you can get a dedicated circuit to your rig. I recently bought a Furutech GTX-D Rhodium power outlet and am just floored by this device. Maestro outlets are good as well. I own a PI Audio UberBUSS for power conditioning which is great, but I was also satisfied with a Mapleshade power strip back in the day. I wouldn't turn these stones over any time soon, just enjoy your equipment and plot your upgrades after that.
If you are looking at a Schiit Bifrost DAC, know that they are planning to implement some trickle-down tech from their top-of-line Yggdrasil soon. I own the Gungnir and have been very pleased, but I do wish it had more detail retrieval. Hopefully the trickle-down tech fixes some of this. If you buy a current generation Bifrost don't expect to be blown away. It's a good all-rounder but I was never taken aback by it. And I like to be taken aback.
Sorry I could ramble all day. Just providing some thoughts.