Granted my experience with a laptop was many years ago. At the time I thought it sounded pretty good. But as usual, better is the enemy of the good.
I think sometimes in this hobby people expect improvements to be on the same scale as tuning a boosted car. You'll certainly notice 150 more hp at the wheel. Whereas with audio upgrades, differences are more subtle. So it comes down to whether or not you want to spend an extra 5K to get that next 5 or 10% improvement.
Now in your case it's somewhat the reverse. You have a 5K laptop and find it hard to imagine something much cheaper could even be even as good, much less better. Only you can say if this could be the case or not. I just know my Lumin sounds better than any laptop I've experienced.