I have a system with a watercooled i7-4790k and a GTX 960. It's a prebuilt HP Phoenix 850-050qe. Here's the link: https://support.hp.com/us-en/document/c04719850. I've had it since June of 2015, but there are no problems with it. I payed somewhere around $1000 for it, but since it's used I don't know how much I wanna sell it for. I'd also need to keep the SSD and HDD that came with it for my new build.