I don't think any project has to be Quorum 2. Sprint and Javelin require Quorum 1, since those disciplines are run for a shorter duration.
I agree on RakeSearch. Hopefully everyone stays away from that as an option.
Amicable would be kind of interesting. I think I was running 8x to max out a 1070 the last time I ran it. I never ran it on a CPU, so I'm not sure if the net gain is big enough to justify running it on the GPU (and using up 1 CPU thread/task) while other CPU projetcs are being crunched.