I bought my 14 Sport, 28k miles last year for just under $23K from a dealership. (Lease trade in) So I know you can find better deals out there. No way in hell would I have bought one that was modified!

If you trust those vendors to do your supercharger rebuild go for it. I had two people send there Vortech supercharger head units back to Vortech as that is how did the rebuilds on two of my friends Vortech head units for $1550 and $1750 as Vortech is how they trusted doing their head unit rebuild. You can choice how ever you want to do your supercharger head unit rebuild. I would be more worried about how long the rebuild lasts than just trying to save a buck.

The only reason I used 928 is because their prices are posted on their site. Vortech doesn't list prices. But personally I would use Vortech as they are the mfg and I have never heard of an issue.

They don't do the bearing upgrade though.

Speaking of the devil!
I just had my SCi V3 rebuilt yesterday morning with the 928 impeller and brand new oil seals.
I believe they sent me the incorrect high speed bearings.
They did not send me the ceramic ones lol.

I will confirm later tonight to be sure though but we are pretty sure we were sent no ceramic bearings