I'm in a similar boat myself. I've been collecting hardware for almost four years and now I have plenty of nice sound cards, including AWE32/AWE64, GUS stuff, Roland MT-32 and SC-55, Yamaha SW60XG and others. However, I'm still using the "beige PC plastic" speakers I've got with my first retro rig back in 2015 - a pair of Creative SBS20s.
Now, they aren't complete garbage, but they do introduce quite a bit of noise and hissing. Also, they don't have proper shielding, so sometimes I get sounds from freaking mouse movement (have to make sure that the mouse cord is away from the speakers), my iPhone receiving messages and so on. Oh, and the headphone jack is complete garbage - I feel like I get all the static noise my PC components can generate.
So the inevitable next step would be to get something more high-end. I kind of think that a "beige retro look" almost always means that you're dealing with cheap computer speakers that were never meant to be powered by the soundcards I'm using. Expensive audio equipment in the 90s was mostly black, so are my Roland modules. So currently I'm looking at this:
Behringer MS16. AFAIK these are just rebranded Roland MA-12c speakers that are still being made today. They cost about 90 bucks where I live. Now, it's kind of expensive for something I would use for DOS gaming, but that's actually cheaper than shipping MA-12c from eBay (never saw one for sale on local boards). Now the only issue I've seen in the reviews is that they are not completely shielded as in I might get interference from a mobile phone.
Has anyone here used them?