I have two Tang Safety style 77's. These were my Dads, he passed away in 2004. As a kid I shot alot with both of these, and to this day, Both still shoot an impressive group. You probably will NOT be disappointed. One of mine is 77v .220 Swift, the other is a .25-06 sporter configuration. I've heard some say that the current ones don't shoot quite as good as the Tang Safety type, This i can't say, I don't own a new style one. I really don't know of too many folks that complain about the Tang Stlye 77's.
I'd say the quality of Rugers may have went down SLIGHTLY after Bill Rugers passing, according to folks who own the newer ones. What kind of price on the one you're eyeing up ?