The Shortblade has great eco (2.941 with Trauma IV and no enhancers), and up to 51dps with enhancers in all slots and Trauma IV.
Current TIR = 4.2
more info on the weapon here: Ozpyn RSB S1X2
Blade is close to min TT, might be a few pecs left. :)
Knifefighter skills needed to use the weapon...