Past experience of Nvidia cards (admittedly some time since i had one but what i have had were always a bit flakey) means i would probably choose something AMD, preferably Sapphire whose cards i have had have always been exemplary.
Not being that anal about pouring over graphics cards and going by what has been posted already i would probably choose a Sapphire RX460 which seems to be under the budget. What slightly puts me off is that any reviews i have read seem to indicate they are noiser and run hotter than comparative Nvidia cards.
Anyone seen any passive cooled latest generation cards yet?