Looking for a PC build 500-600?

Hi, I'm a pretty avid PC gamer, I was wondering if anyone knows a good PC build ranging 450-600$. The only reason I'm asking is because it is my first time fully building a PC, but I've torn into computers and switched around parts before. I'm looking to run Minecraft, DayZ, and a few others with settings medium to max. (I will get DayZ when it comes out of alpha so it doesn't lag as much). The only thing I need to have, is an HDMI port. This is a must have. Other than that, I'm fine with whatever configuration you have in mind. Thank you very much!

Added (1). Update: It must be windows 7!

There are a lot of good pc's on this website which are what youre looking for, this in particular http://www.pcspecialist.co.uk/view/Vortex-500-gaming-pc/

The last answer was not that complete, since you wanted a custom build.

GTX 750 Ti: $99.99 at Newegg
Intel i5 CPU and MSI motherboard: $239.99 at Microcenter

Replace these parts in your current PC for under $350.

How To Build A Gaming Computer Under $1000: http://astore.amazon.com/...der1000-20

Including Processor (CPU), Motherboard, Memory DDR, Graphic Cards (GPU), Case, Hard Drive (Boot Drive), Optical Drive, Platinum Power Supply and Operating System (OS).