The HKTS systems are actually quite good (made by JBL), both the satellites and, perhaps even more so, the sub. Most who get them tend to comment quite favorably, particularly as to their home theater applications.
Assuming for the moment that the KEF's are indeed better for pure music listening (they might not be, price notwithstanding) you may want to consider if you will be getting larger front (and perhaps center) speakers in the near- to mid-term. If so, I might suggest not spending the additional amount now on the KEF system, as much of your future listening will focus on the upgraded stereo speakers and perhaps center channel speaker. If not, it is up to you to figure what you want to spend, including assumptions as to relative quality for pure music reproduction.