Well, I think everyone can agree that when it comes to conditioners, you need the professional kind. The store bought ones will not give you the essential nutrients your hair needs even though they claim that they can. Since you decided to do such a radical change in your hair color, the texture of your hair is completely different now and you have to adjust to that. Now, I can not physically feel your hair to tell you exactly what you need but here are my professional recommendations:
Schwartzkopf Repair Rescue Sealed Ends: This product is designed just for the ends of the hair. This will help to prevent split ends as well as keep your hair looking healthy and shiny. It is a protein so it will add strength but unlike other protein products out there, it wont make it feel like straw.
Redken All Soft Heavy Cream: This is a deep conditioning treatment that can be used 1-2 times a week. I would start off twice a week for you for a month and then use it only once a week. It works like a charm. It has avocado oil it as well as gold chamomile. The hair feels amazing afterwards.
Redken All Soft Conditioner: This is a regular conditioner that you use after you shampoo. It works beautifully. I use it every day and my hair is amazingly healthy with all that I do to it.
Also, I would recommend that when you do a conditioning treatment or just when you are using a regular conditioner after a shampoo, use a towel to dry off the ends of your hair while you are in the shower. After you have done this, apply the conditioner start at the ends first and work your way up, you do not want to get too much on the scalp because it could make it look oily. By doing this, you are giving the conditioner something to hold onto. Water molecules are big and conditioners can not break through that so if your ends are somewhat dry, that will allow the conditioner to soak into your hair cuticle to keep it healthy and strong.
So...I would like to add one more tip or suggestion! You say you love to bleach your hair?
Well, salons now have color lines that offer a bleached look but without the bleach. It is a high lift color and there are many different shades of blonde's you can achieve with it. I do know the schwarztkopf line as beautiful blonde shades that range from golden tones to beige to more of an ash/platinum. The 12-1 shade sounds perfect for you. It would give you the platinum look without all the damage from the bleach.