welcome Miquel if you search the strain forums and possibly the FAQs there are many suggestions... but try The Attitude.... or Gypsy Nirvana Seed Boutique edit heres the links The Attitude http://www.cannabis-seeds-bank.co.uk Gypsy Nirvana http://www.seedboutique.com
Is this your first grow ? you might not want to blow your wad on seeds till you have a few grow under your belt. Mr. Nice has some find strains.-Bud
I recommend The Attitude for a seed bank to order from. See the link in Bigbud214's post. As for breeders, I recommend anything by Mr. Nice or DJ Short. and Cali Connection are all reputable breeders that I have had good results from.
Here http://www.sanniesshop.com/ Here you can interact with the breeders https://www.opengrow.com/index.php?act=idx The place is full of love, all i can say. No egos...no bull shit. I have recieved more free beans than i have bought. Not about money there, its about learning and sharing Good luck I suggest the Jackberry for a 7-8 week indica with lovely colours asssit: or a Killing Fields for a purple 10-12 week sativa...but im a color whore