When people can't even agree on what a gish is, I doubt that voting for the best will do any good ^^
My favorite is 17 tempest cleric/3 sorc
V human
Start as sorc -> s1/c5 -> s3/c5
14 10 12 8 15 13 -> 15 10 12 8 16 13
Full heavy + shield armor
Full cleric progression
Twinned spells and cantrips...