i am planning to get Gygabyte gtx670 windforce 2x. or may be same gtx660ti (depending on PSU budget) is gygabyte recommend?
A lot of Gigabyte cards are great all-rounders. They aren't the fastest or the best overclockers, but they are right up there, cool well, are virtually silent and cost a lot less than their competition.
In general, you can't go wrong with a Gigabyte card.