Thanks Astra
You pretty much covered everything I wanted to know!
I will only be using it to read fiction but a lot of the stuff I have is PDF format but the screen is just so much nicer on the 505 I might just go for it.
RCR: I am in Melbourne and I did read about the meet-up but I have a problem with being impatient and want my shiny new gadget asap
So I'm going to stop worrying and just go for the 505! Thanks again everyone for all your help!!