Need advise on upgrading storage in desktop pc

Hi,
       I am looking to add a 2 tb 7200 or more RPM hdd in the system as the current 1 TB hdd is running out of space. Currently i have 2 X 4 GB RAM and i want to boost it to 16 gb which is the max capacity of the motherboard. I need to run virtual box , in order to run linux in it.



Is it advisable to add a SSD hdd in the current system config?



There is a issue with my graphic card (i think) because when i increase the monitors brightness the screen looks weird and when i decrease its brightness, the content on screen looks better. Is it the issue of Graphic card or monitor?


Please help.

Thanks!



I didn't find the right solution from the Internet.



References:
www.cnet.com/forums/discussions/need-advise-on-upgrading-storage-in-desktop-pc/


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