For me I think th ebest mod I have found and I have it is the Gold Tiger Saw and Marquee from pinball pro. I reckon it adds to the appeal of the machine. Looks great and adds functionality to a stationary saw blade.
The non-motorised one for USD$25 is a pretty cheap way to bling it up a bit.
I'm looking into LED's for the ToM. Have seen some on youtube and it looks very nice. I think I like LED's in general as it adds a bit of aa wow factor, but can see how the old school look would appeal too.
I have put LED's on my ToM in certain places. But I tried a colour changing LED for the Tiger Saw Insert and mate, it looks fantastic. You hit the staionary ball and the insert cycles thorugh colours. Well worth a try.