Help with purchasing cubase minimum requirements

My question is regarding which version to purchase. I’m trying to figure out whether to purchase Cubase Artist 7, 8 or 9 with the hardware I currently have on my PC. Any help would be greatly appreciated. Thanks.

My PC’s specs:
Processor: AMD athlon II X4 620 processor 2.60 GHZ
RAM: 12GB (expandable to 16GB)
System: 64 bit operating system x64 based processor
Windows 10 Pro
HD graphics card: AMD Radeon HD 5670
500 GB SSD hard drive
1 TB external hard drive

The minimum system requirements should be available in the manuals of the different version. If you want to purchase new, you will not have much of a choice anyway.