AMD Radeon 5770

I'm looking at the TE01-0014 from HP, but it says it only has a "180 W Gold efficiency power supply". I have an old GTX 260 and a Radeon 5770, would that power supply even be enough to handle adding one of those in? Or would I be looking at getting a new PSU and a new GPU both? If so, any...

Now I'm powered with, -Core i3-530(To newer i3? or To Pentium G3258(OC) or To i5?) -Gtx650 (To Gtx 960?) -4GB 1066mhz Ram (To 8gb? or 16gb?) -500 WD (Shd I get and ssd or another hdd or none?) -Crappy Acer AL1751 1080p Squared monitor from 2008 (Newer, wider LIKE 21.5inch Monitor?) I'm...