Rhinoseeds (http://www.cannabis-seeds.co.uk/)
Bought: Atleast 6 times from them with no problems, except once. When the problem occured, I had to email 'em several times and get nasty before they stood up to the plate to do the right thing. In the end, they did do the right thing though.

UPDATE: I've just purchased from them very recently, a decent sized order. It was 5 or 6 different strains of fem seeds. A package arrived within one week, pretty impressive so far.

I opened the package, and realized it was only part of my order, so I emailed them, and got a reply within 24 hours, explaining that they only ship out 3 strains at a time for stealth reasons, and the remainder of my order should be arriving shortly. It did arrive in a few days too.

All in all, I give them a 5 star rating!
Peace