The big black saw was the Silky Katana Boy. It cuts like a chain saw, but it's little bit pricey. I don't use it for everything, and I have no regrets.

And there are lots of Japanese saws that are re-sharpenable, but you'd have to order one from a reputable place. There's also a lot less information available on sharpening Japanese saw teeth. For 8x8 probably around 360 or 390 mm long. If you want one, I'd call Hida tool in Berkeley. I'd guess that they would start around $100-150.