a price range is gonna help alot, also what is your primary use of the hardtail will help people give you good info on how different frames rides different styles and terrain.
i like the yeti dj they feel really nice to ride and probably the best hardtail i have ridden to date.
however price is high and i dont have alot of experience with hardtail frames.
hopefully you find the right frame but a bit more info would allow you to get a much better answer.