You really don't gain much with an aftermarket impeller, not much bang for the buck, if you go aftermarket it depends what you want. Do you want quicker out of the hole, or faster top end. The stock impeller is a good balance between the two. Faster out of the hole I would go with a Skat Trak, better top end go with a Solas. Nujet honestly is kinda iffy, they're like the KMart of impellers, it will work but not the best quality.
You also have another option, SBT offers a rebuild exchange program for (I think), $65.00, for the OEM, probably a better option than the Nujet.
Lou