You've hit a plateau I think. Upgrade one and you'll look eventually to doing the rest. I'd go for improved speakers to start with. Mainly, seeing as you'll probably ask, as the amp is still good and you can add PSX power amp to it for relatively little money in time, the CD player will be fine for the DAC Magic, leaving the speakers. They are good, don't get me wrong, but upgrading them to something one notch up will reap rewards I suspect and they've hit their ceiling with your current level of equipment which can take better.
I had a pair of the 733i and changing to the 752 just opened up a whole soundstage that wasn't there before, so even speakers one level up will make a difference I think.
Other models are of course available and it depends also on what sound you are looking to achieve, but check out Q Acoustics, Acoustic Energy, Teufel, Wharfedale and KEF who all make wallet friendly designs up to £400/500.
One last thing, your speaker cable is hopelessly out of kilter for the equipment you have at around £13-15 a metre. This won't save your system or what you hear. Sell it on, buy some generic copper cable, 322 strand is what I use and my system sounds excellent (see Roger Russell's site about wire thickness - he knows his stuff being ex-McIntosh). It cost me £5.50 for 10 metres from Digitalis Direct on Ebay, postage free too. Give it a whirl, this is about the cost of two pints we're talking here and use the rest of the money you make of the QED wire to put towards some new speakers. Your other interconnects will be fine so no need to change any of those. Audioquest make good stuff and I used those before I opted for generic (unbranded) cables interconnects.