Nice frame. That was one I was considering but I got this cheap. What I can tell you about 243 is it is STRONG. My buddy rode it full time in whistler. Put in almot 50 days up the mountain on that bike. Broke a set of profiles before the frame

I love evil. Light, strong, the bashgaurd is amazing and the system holds up well. The box guide is ok. My cousin uses it and it makes a tonne of noise from that top portion. It seems finicky at first but you can make it so it only make noise in the 9th and 1st gears. (when chain line is most extreme)

Manitou has one. Mazocchi used to make a sc version but I am not sure if it is still available. Avalanch makes one. Past that, it will be all 3rd teir companies...and usually heavy price tags.