| Tough question, but I'd go with Mosquito Hide Boots/Blue Ceramic Band. Most people would consider them lackluster items, but they made charming so much better. With insta invis and damage, a good chanter didn't even need any other gear. I got offered ridiculous amounts of plat for those boots and just laughed... best 15k I ever spent, well, except for the 20p I spent on the band.
However, I really loved the concept of the gear that leveled with you. Too bad that didn't really go anywhere with it (or if it did, it was after I'd gone). | 