One more for the pot Whirly as you're determined to stay PC.
Any of the companies mentioned will build a decent PC but spend any time on this maddening forum and you will see support is the real issue - software, operating system, drivers and comms.
I'd suggest very strongly you have a look at Evesham. Their PC's are the same but I'm pushing you their way because of their 'big brother' support system. As well as all the usual on-site tech and repair stuff each time you log on they will contact you if there are any updates, security patches or new drivers for your system and they send them down the line to you. Your PC stays tuned, current and virus free by logging on.
Regards
Rob