Totally stole this from the One Piece section. Sue me! :P
My favourite arc is probably Tenrou Island; lots of cool fights and Mashima managed to juggle 20+ good guys and still give them all a good showing. I also like the Fighting Festival Arc just because I thought the set up of Freed's runes making everyone fight was really fun, but I was a little disappointed Gray didn't get to do more. I'm really enjoying the current arc as well.

