I am a HUGE fan of Redken's So Soft range.
I have quite fine, utlra straight, blonde (dyed) hair and a lot of it (as hairdressers always tell me). It was very difficult for me to find a good quality shampoo that gives me really soft, but not greasy looking hair.... but then I tried Redken So Soft. It's amazing. I got all of my friends into it!
Unfortunately Redken stopped doing the leave in conditioner, but now do the velvet whip, which is a good enough substitute.
I use all the products as a bit of a treat for my hair and whenever I use them have a good hair day - the only problem is the cost, as they're a bit more expensive than other high street brands.
Mary Hockney