there is something called "tournament driver" within synapse. it's still not optimal, but maybe it'll do?
that said:
microsoft intellimouse explorer 3.0
zowie ec1 / ec2
steelseries rival / rival 300 / rival 700
logitech g402 / g403 / g502
coolermaster storm alcor
gigabyte xm300
from the above mentioned, in my opinion only the intellimouse explorer is actually similar to the deathadder, but it's really old and very lacking.
you could just get an old deathadder, one that does not rely on synapse. but of course they are dated in some ways.
there are probably many more options out there though, there are just too many brands nowadays. a few minutes of google should get you a lot more results.
anyway, my suggestion:
- deal with synapse
- get an old deathadder
- try out a new mouse