Here are my favorites:
Cleans:
M Britt's Polytone MB3 profile, Vibro-King 4,Voice 15 3(Vox AC15)
Breakup:
M Britt's CTone SRV 5, Vibro-King 4 (w/Green Screamer)
Distortion:
M Britt's Dumble ODS N3 & N5, Train wreck 3 & 2-,
Acoustic:
Dorrus2's Fishman Performer 'f' (2 more of his profiles for slight eq tweaks), JoeR's Shorter Unico profile (tweaked)
If you asked if I had only ONE "for the island" - rather than gun to your head it has to be without a doubt:
M Britt's Dumble ODS N3
... unbelievable how I can get the full range from clean round (even with 'normal' output humbucker) to full Dumble heaven with all shades in between - heard someone doing that with a 'real' ODS
Cheers,
Wolf