"find out a solution for running & testing some sort of operating systems on actual machine (Core i7 4770/8GbRam) and thought that WMWare Products will fit nicely."
Bit confused here - this statement does not sound like you want to run virtual anything.. When you say actual machine - that sounds like baremetal testing to me..
What exactly are you wanting to test.. That the OS works on specific hardware, or are you running something inside an OS and want to make sure it works?
If what your wanting to test is something running on an OS, and you have multiple Oses you want to test - then yes virtual would be the way to go. Do you have dedicated hardware that these VMs will run on? Or you want to do this on your desktop?
If you have a dedicated machine that will run multiple VMs - then I would look more towards esxi in the product line.. If you just want to test stuff now and then via your own desktop running the vms - then workstation sounds more like it.
If the desktop route is where your at - how about just look at the free virtualbox solution? https://www.virtualbox.org/