Personally I would suggest either; Sipsmiths VJOP (Very Juniper Over Proof) or Berry Brothers & Rudd for Dry (and I mean Dry) martinis.
They feature in the top ten of this article: http://clubbers-house.net/top-10-gins/
I'd actually be interested in hearing if the reviews stack up about the number 1 gin on the list; Monkey 47? Anyone tried it?