For a motherboard I'd recommend a Z97 chipset so you can overclock the 4690k, but a more precise choice depends on what you want in the system. Perhaps check out some of the CPU-motherboard bundles and choose one that comes bundled with a 4690k, they are usually good choices.
If you go for a GTX 970, the ASUS Strix is one of the top 3 and a good choice. Other 2 are the MSI or the Gigabyte G1, both of which clock a bit higher.
For PSU, choose any from
this thread. The Antec you've chosen is on there, so good choice. Perhaps go with an EVGA SuperNOVA (around the same price) instead for modular cables? They make things much easier.
As for case, it might I suggest an NZXT. Their cases are usually nice to build in and have cable management space. The H440 has a window and a PSU box to keep things neat, the H630 is more silent and has an SD reader (also on sale this week). I think you should look at the cases yourself and see what designs you like best, since the case is the most important for aesthetics. Phantecs is also another good brand.
Edit: Stulid beat me to it X) I'd say £700 is not quite enough for gaming 1080p at the highest settings. Give yourself £100 extra and go with Stulid's first suggestion but upgrade that 960 to a 970. Best choice IMO.
