[quote user="benwar101"]I liked the idea of changing my cd player as its the oldest part of my system[/quote]
I would be very surprised if that would solve your problem. To get substantially better CD replay you have to spend more than an entry level Arcam, assuming that is what you were looking at. Whilst every component in your system is important, with far eastern manufacturing you have very advanced electronics in even budget players such as yours these days. The difference in (sound) quality between this and the next range can be rather small as opposed to say turntables. The level of mechanical engineering involved there dictates a clear increase in cost and usually, though not always, better sound in the process.
The reason for the listener fatigue you experience lies, mismatching of components apart, with your speakers. Budget Kef's are not refined nor do they in my opinion excell in any other way but I won't go further than that.
And again ... Cable changes are a means of fine tuning a balanced system not a cure for a badly matched one.
Perhaps the editors can suggest something different to help you loosing money in the process.
I also can't believe I've written such a nice reply.