Being a self proclaimed reformed seed junkie, I would say if you have to ask you already have too many. If I had it to do over I would have enough seeds for the next grow on hand, learn how to clone and do a little CS breeding and spend the money I have tied up in seeds on lights and such. I dont worry about the seeds going bad because they probably wont but the new strains will get better and you may not want to go back and grow some of those old seeds.