Agreed both EVGA and XFX, can't go wrong with either. Also Sapphire is another good company.
All things considered, the 5850 is still a great buy and comparable to the 470.
...Gigabyte has a HDMI port while MSI has a mini HDMI port.....do u think the HDMI will perform better in video quality than Mini...? or is it ok that I buy HDMi to Mini HDMI adapter.......will there be any difference in Video quality if I use an adapter??
Should be no issues using an adapter, however you should consider a DVI to HDMI video cable
or a HDMI to mini-HDMI cable
so as not to worry about an adapter.