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As in I need something tomorrow, its 1pm and I can order knowing fine well it'll be with me the next day, regardless if I pay for next day delivery or not.
For me its on one/planet x and Merlin. The other day I bought a seatpost from Planet x, paid for it at 3.30. Arrived 10am the next day standard delivery. Awesome service.
I'd vote for the same as you - Merlin was the company which first came to mind, but now you remind me I've always got next day delivery from on-one as well.
Merlin. Deliver next day every time. Superstar when ordeing pads, again, next day every time. Had to wait over a week for some pedals from On-One.
Alpkit - I like the handwritten 'thank you' note with each order.