i was asking this question last month. you can check my posts
i had various opinion on the speakers finally i trusted my instinct and opted
to try logitech x-230.
since i am living in small town i dont have privilege of testing them first.
so i prayed and gave direct order of speakers.
And i cant simply describe the performance of x-230.
Its simply amazing ( i had previously s-700 artis). the bass rocks. listen to
hindi song (AAp ki Khatir- I Love You for what you are!!). The bass is really
tight and fair bit of thump.
Atleast i dont think you can expect this type of performance in other sub 3.5K speakers.
And tomshardware tested this speakers to upto 106 SPL and they stood firm
with uniform result in whole wavelength.
My suggestion is please listen to x-230 once before spending your hard earned money!!