I have a TWM Type R in Gun Blue/Satin Black, and I can say, get the silver Satin finish. My friend has the M1 in that color, and it's just a bit faster to cool down than mine.
And I agree with J-Ro. TWM may be expensive, but it IS counterweighted and counter sunk. It sinks too low for me, actually. I had to put the lock nut all the way in so it sits just right.
I might be buying an M1 myself soon, so my Type R will be on sale!