As mentioned, it's a bit subjective depending on the persons taste.
Couple of others I don't think have been mentioned:
Silverback Gin made in Alton
Twisted Nose made in Winchester
Mermaid made on the IOW
Salcombe Start Point made in,well,Salcombe.
All delicious but for different reasons.
(And personally I wouldnt ruin any of them by sticking Schweppes in them)