@Jeremy - Yeah, I’m using parse too with develephant’s mod_parse module - its really easy… Im using this to store my user objects / facebook linked accounts, etc. It just doesn’t seem good for storing lots of general type files so i think I will go with amazon S3 for that aspect.
On a side note, have you seen develphants coronium server? you should check it out - I thinks its still in beta, but it’s starting to look awesome. I think eventually it will do everything that parse does plus a whole load more. It’s fully open source too. you just have to pay for the cloud server to host it. I would of considered using it but im working on my first app and didnt want to worry about the whole back end side of things too on top of learning all the mobile stuff 
@nmichaud - definitely sold on amazon S3 now 
Thanks everyone