Not many models have a backlight.  Those that do:

CatEye V3
CatEye V2c
CatEye HR200DW
CatEye CD300DW
CatEye CC-MC100W


Sigma Sport BC1606L
    it's not huge...  imagine that!   http://gallery.mtbr.com/showphoto.php/photo/90560/size/big/cat/501  Who would want such a thing??
    reviews: http://www.mtbr.com/reviews/Computer/product_129999.shtml
    manual: http://www.sigmasport.com/en_media/produkte/bikecomputer/topline_wired/bc1606l/allgemein/visuals/ba.pdf

    $27 at Amazon, for backlight AND cadence!  Ding ding ding, we have a winnar.





resources
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http://www.cateye.com/sites/cateye/upload/product_charts/07POS(CC).pdf?height=700&width=400&keepThis=true&TB_iframe=true