Ali wrote:
I am looking to put some photos on the net, so have been looking at
photo sharing sites like PBase.com.

Out of the ones I have looked at, I like PBase the most, but I want the
large version of each photo to be more than 800 pixels per side (in fact
more like 1280 pixels). I would also like the large version to open in
a standalone page (so basically all that is on the page is the actual
photo itself).

Any suggestions, apart from creating my own website?

I've been using sharpcast.com. Downloading from it and the slideshows
it does are more like your 1280 pixels. And, it's free!