Best PC spec for Sketchup and rendering packages

Hi All

Im a mac user at the moment but feel I need to switch to a pc as Im doing more rendering and it takes ages on the mac and often crashes. I would also like to use more advanced rendering packages which don’t support OS.
The key of me is speed, so please can you kind people give me a good build spec for a full pc set up. (screen and all) and possibly good place to buy.
I have a budget of £2300 GBP