>>Anyone wish to recommend an inkjet printer for  medium volume use.
>>The duplex requirement eliminates most available printers.
>>The all in one preference even more.


Answering my own question.
I just have to sit on my hands and wait for the canon i750 & i780 "all in 
1's" to be released "in November"

Prior to that the ip8000 & ip9000 (available overseas but not here quite 
yet) do what I want but not in an all in one.

The new all in ones seem to match my need completely and then add some extra 
features.
All the normal fax, photocopier, scanner, printer, ...

2 picolitre ink drops (just for fun)

Duplex as standard

CDR printing

Borderless prints up to A4.

IP780

 
http://www.canon-europe.com/For_Home/Product_Finder/Multifunctionals/Multifunctionals/PIXMA_MP780/index.asp?ComponentID=205476&SourcePageID=26562

IP750

 
http://www.canon.co.uk/for_home/product_finder/multifunctionals/multifunctionals/pixma_mp750/index.asp

Interesting animation of internal duplex from 2 paper source on eg ip4000

 
http://www.steves-digicams.com/2004_reviews/ip4000/duplex_printing/mov/common_contents.html

Of course, you could always go mad and get a 1 picolitre drop size printer 
:-)

        http://www.steves-digicams.com/pr/canon_09092004_pixma_pr.html

    Canon's PIXMA iP5000 model is the industry's first printer to feature 
microscopic 1- picoliter ink droplets for virtually grain-free photographs. 
The PIXMA iP8500 photo printer is Canon's first ChromaPLUS eight-color ink 
letter-sized format photo printer, designed for photographers and consumers 
seeking vivid color and precision with the highest level of photo printing 
quality. For households connected to a wireless network, Canon's new PIXMA 
iP4000R photo printer combines high speed and brilliant photo quality with 
wireless capabilities, making it the first 802.11g Wi-Fi model available in 
Canon's PIXMA line.







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