Harman Kardon SoundSticks II vs Logitech Z-2300 vs JBL Creature III

I'm also in the market for a computer setup and I'll probably get the Swan M10

I have the HK Soundsticks II and like them very much. I hide the sub in a corner behind my iMac, and the two smaller speakers are very slim and easy to place on either side of my screen, where there would not be much room for bigger speakers. They also look good in my opinion (so do the sub, but I have no space to display it visibly). The sound is quite good for use with the computer, where I mainly listen to YouTube and internet radio via iTunes (for movies and "real" music I use an Onkyo/Paradigm HT setup).

One thing I like is that the HK SSII uses a 3.5mm minijack analogue input rather than USB, so I can choose to feed it either using the iMac's analogue outputs directly, or using USB or optical out from the iMac via a Cambridge Audio Dacmagic DAC and an old leftover NAD integrated amp I keep in my study (using the pre outs on the NAD, which gives me access to it's volume, balance, bass and treble controls). The pre outs from the NAD are nicely matched to the HK SSII input levels. The sub has it's own volume control, but that only needs to be set once, to balance the system.

I have not tried the Logitech nor the JBL speakers, but I guess they both will give you good sound. It will be more about footprint and connection type, how you like the look of each, and possibly price.

Good luck!