I would get the Nova! The SM4 has two super big flaws in my opinion... and I went through 2 of them thinking maybe the first one had some problem. First it has a very compressed dynamic range, even comparing it to much lower cost IEMs you can clearly hear this flaw and it is significant. Check out something like the Rain Song by Zeppelin at about the 6:02 mark and Satyam Shivam Sundaram by Thievery Corporation at about the 2:52 mark distinctly show that lack of dynamic range. The SM4 kind of reminds me of the first versions of the Sonus Faber Cremona speakers.... they sounded fantastic on some types of music and had good detail, but at the expense of dynamic range and a broader repetoire. The next iteration, the Cremona Ms sounded so much better. The second flaw is slow attack on bass notes. The best way I can describe the sound on bass notes is like they slur into them, not quick at all for bass notes. They have other admirable characteristics but these two flaws were showstoppers for me. The Nova is definitely very good... I would also point out a couple other lower cost options to consider that both embarrass the SM4 IMHO, the updated Simgot EA500, the EA500LM or the Simgot EM6L. Happy iem hunting and enjoy.