If you want to go with the original i9700K you mentioned you can actually find some bargain prices. I would only suggest going in that direction if you can find good prices, though since the 10 series are more recent ( the i9700K is still an awesome CPU though ). I think the 32GB of ram is too much maybe so drop that down to 16GB which gives you some more money to spend on other components. Graphics card is very difficult at the moment, the prices are just insane. As for the motherboard, well, there are tons of z390 still around at good prices, like the Gigabyte Gaming X for about £130. You may also like to get a smaller NVMe drive, say 256GB and a small hard drive of 2TB say to give you a little more storage space for games.