We currently have a mix of Toshiba, HP and a few acers. I believe all our next laptops will be HPs as our network is pretty much all HP. We also bought 20 HP 530s last year, which I cant really fault, the only niggle being the lack of a hard drive LED so you can never tell if its crashed or is busy.
The Toshibas are a mix of L20s and L40s. These are eventually due to be replaced.