I personally have a Novarossi Rolling in truggy. Was rocking it in my old ST-RR and hopefully this weekend will be putting it in my MP10T that I'm building.
I got mine on ebay from a guy in italy for about $160 and he ships super fast.
I've heard the Nova P5 is pretty good in truggy and there is one nib being sold in the forsale section for $150.
I know some guys run the Werks B6 in truggy and like it.
I believe there is a guy in the forsale section selling a nib os speed spec III for less then $400. I know its discontinued now but it was the motor of choice for some in truggy and heck if its brand new.