hi sifus,

i've been very happy with my Logitech X-530 70 watts RMS 5.1 Black Speaker System which I've purchased since 2007.

They pack quite a power and has exceeded my expectations for a set of speakers.

However now in 2014, their time has come and some of the speakers sometimes do not make sound and I think the subwoofer is half dead.

I'm looking to replace them and they have set a pretty high benchmark.

If budget isn't a problem, what is a worthy upgrade to replace these babies?

Please do advise as I am alien to this and opinions of sifus will be put to good use. Thank you!