I'm I'm think of getting a r9 290 or r9 280x but I would I a new CPU and motherboard
So just wondering what the best i5 + mobo combo is for £200ish or less
No.
Z97 motherboards are meant for overclokcing.
If you don't know how or don't want to OC,then get an i5 4690 and an AsRock H97 Killer or a Gigabyte GA-H97 Gaming 3.
All the best.
You can search for some tutorials online.
Here's a good guide:http://lifehacker.com/a-beginners-introduction-to-overclocking-your-intel-pr-5580998
Don't mind picking a solution.