The Cyber Acustic set shows 80w rms over Logitech's 70w but that doesn't mean much there. I find the 70w rms here quite adequate for the older Logitech Z-640s no longer seen available.
If you are unsatisfied with the current set then Logitech would be a good alternative. Logitech offers great sound quality on their sets as well as some higher priced brands. Sound Blasters always sound better over onboard as you found out there.
The main difference you might notice with either the 540s or 530s is a smoother overall sound. If you were without a good set and looking for one or disappointed with the sound quality of the current set I would pick another brand like Logitech. Otherwise you may fixing something not broke to begin with.