I know you say that you are looking at a reputable manufacturers, but I just thought I'd say that I have the Dell brand power adapter for my Inspiron 6000 (very similar to your 1505e). I don't know if you noticed this model or not. It can be auto, air, and AC, which can be nice since you don't have to carry two adapters (one for DC power and one for AC power) around with you. Maybe the ones you are looking at have all three options too.

 

However, if you do get one from Kensington, Targus, Igo, etc., just make sure you get the correct wattage otherwise you may damage your notebook.