Get Z97 as its a more up to date mobo using a better CPU.
If you have no plan for updating to upcoming broadwell or using M.2 & sata express then there is no difference between Z87 and Z97. Personally, if purchasing new, I would go for Z97 motherboard since they have very close price range. A decent Z97 £100 can serve you well.
My suggestion: Asus Z97 AR. Fantastic bios, excellent bios fan control and good 3-4 pin fan headers position.
How many graphics cards will you run with the board?Thanks for the input however I am going to be using the same cpu - 4770k
Again thanks, however that mb has the same pcie spacing as the board I have now.
Looking at boards with the same spacing as :-
http://www.overclockers.co.uk/showproduct.php?prodid=MB-487-GI
Z97 for the simple fact its newer plus more native sata 3 ports
How many graphics cards will you run with the board?
2, my top card runs @15 degrees hotter with 1 slot spacing in my current board.
With the other board layout I would have 2 slot spacing which is the same as the bottom card in my existing setup.

