PDF or JPEG for map scanning?

Hi all

I'm getting my caving clubs entire map library scanned at a scanning
bureau. I have yet to discuss with them what format they would use but would
like to me as knowledgeable as possible when I do so. 

Question: For line drawings should I get them scannned and saved as PDF or JPEG?

Info: They range from A4 to 1.5m long x 1m wide. Mostly B/W and 300 dpi is fine.
      Purpose of the scanning is to provide access to the data and as 
      anarchive in case library burns down.
      Number of maps ~ 200

Pros/Cons:
 
+ jpg: Small and can be easily edited/manipulated by Gimp etc.
- jpg: I know that jpeg may have artefacts with lines and it was designed for
continuous tone images such as photographs but maps are line drawings, though
faded and smudged.
- jpg: No size embedded in the image. It's just pixels wide x height.

+pdf: Image size is embedded in scan. It will print at the correct size 
      (which is important for maps).
-pdf: Harder to post process. Imagemagick can convert to jpg via ghostscript.
      Windows users probably won't be able to rotate, crop or scale.
      Gimp does not handle PDF well.

I have read at http://en.wikipedia.org/wiki/Portable_Document_Format
a bit about how PDF stores images. Answer=Many different ways. JPEG does it one
way. Scanning as a TIFF I think will end up being too big in file sizes.

Does anyone have any advice / experience here? 
  
Mike Lake

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