[Inkscape-user] how can one control the export bitmap quality

I've made a poster of 5000 x 8000 pixels (the canvas in document preferences). I would to print it as is, without losing one single pixel of resolution of the images I've stitched into the poster.

I would appreciate some clarifications:

- How is one to print the poster now at maximum quality?

- Can I choose to export to eps? I did that two weeks ago in an ubuntu-dapper machine, but now in this kubuntu-dapper laptop I can't see how to export to eps from the Inkscape's menus.

- How can one control the quality of the saved .png when exporting a bitmap? How does the '90' DPI default resolution in inkscape preferences relate to this?

Thanks for any insights.

Albert