Well, after a day of hard web research, I shortlisted some PC speakers to replace my Altecs, the list is as follows;
Although I do like Bowers and Wilkins equipment (I have the Zeppelin Air and it sounds incredible) It appears the B&W don’t have a sub, and therefore produce all their bass from the two desktop speakers.
According to some reviews on-line this apparently can cause the desk they are on (in my case) to vibrate excessively. Excluded these.
The Klipsch look good and the reviews are great, but as John Lewis had the BOSE on display and I could actually listen to them, I decided to get them.
Now I have to look forward to running them in for the next few months.