no card should give HW errors, if it does your settings are wrong...
I like the 280x toxic, because 280 is a great architecture, and the toxic is the best 280x card (in my opinion).
it is a powerdrawer though if not properly undervolted!
If you have to decide between 280x toxic or 290 tri x and 290 cost just 50 dollars more, which you choose?
290... 50$ for 100 KH/s is a no brainer.