So you already have a build in progress with EMG but you want a new gun NOW, which will eventually be turned in to your backup gun?
For dots, I’d seriously look at the Romeo 3 XL. I think that’s the next I’m going to try.
For mags, everyone loves MBX. I don’t have any 155, but that also seems to be the way folks are going. If I were putting a set together, I’d get 4 170 and 8 155.
I hate chasing brass, so for that reason I’d go 9mm Major.
Back to builders... I doubt any would be that much faster than Eddie. So you need to find something used or pre-built. I think Atlas has some pre-builds available. But I’d just scour the classifieds here until something good pops up.