You guys probably cop this a bit so sorry if it's a repeated question. I have a mate looking to buy a quality cutthroat, has used them before,store bought Solingen I think, but was looking to upgrade. My question is what are some good brands or even makers I can check out? And what are some things I need to look for as far as quality goes , I'm a knifemaker so have a fair idea but I don't use one myself so am certainly no expert.