Yeah, if you're happy with everything and just want an improvement in bass, if I were you I'd get a good sub and some kind of integration device. Something like an SVS SB2000 sub and DSpeaker anti-mode 2.0 will get you full-range, quality bass nicely integrated with your room and speakers for not too much $$$.
To get better bass without sacrificing other areas you may need to spend a little more. The first thing that popped into mind was Joseph Audio Perspectives...
https://www.audiogon.com/listings/lis9c5ga-joseph-audio-perspective-monitors?refsource=hifishark
Or maybe Vandy Quattros, but they'll be above your price range too. Best of luck.
To get better bass without sacrificing other areas you may need to spend a little more. The first thing that popped into mind was Joseph Audio Perspectives...
https://www.audiogon.com/listings/lis9c5ga-joseph-audio-perspective-monitors?refsource=hifishark
Or maybe Vandy Quattros, but they'll be above your price range too. Best of luck.