I take internet TABs with a huge pinch of salt. As you say, most are inaccurate. After a while the bad TABs become easy to spot. I use
Fresh Tabs : Guitar, Bass, Guitar pro and Power tabs most often but I wouldn't say they are accurate. I usually look for the most accurate looking TAB and then figure out how it should be played (or how I want to play it).
I would be interested if anyone has any sites they would recommend.