Since only some Primaries are actually competitive with Scrappers due to the AOE shenanigans I'd suggest one of those
So Staff, Electric, Street Justice, Kinetic Melee, Savage Melee
The Two Swords are okay since they get the big Cone too if you want to go with them.
I'd avoid any of the ST only sets.
If feeling fast is a requirement, Both Street Justice and Savage Melee feel fast generally. (Well Street Justice does have Crushing Uppercut which is Slow AF, but it hits like a 10 ton Hammer. So its more fast fast fast SLOW BAM.. repeat)