Not sure I would run a 5770 off of a 375W PSU. Of course, it uses about as much power as your old 3870, but hey it's up to you. As for the IT guy, who knows what his reasons are. Right now ATI cards offer the better price/performance ratio and of course offer nice things like eyefinity
. He could just be an nVidia fan guy, or he could have had bad experience back before AMD bought ATI and their drivers were still crappy, or worse, back in the 8500 days
(one of them killed my epox 8kha2+).