Haha, TBH.. a lightmeter isn't ranked too high on my "to-get" list.You should definitely try changing the buttons, it totally changed the way i shoot.. it may seem more complicated at first, but it's alot more efficient.
Oh damn, i forgot you live in Canada. 93 vs 200 is a ginormous difference

@Futurama, the samples i promised. Is this what you wanted? lol..
All shots taken at @ f/16 1/6 ISO640 Tripod mounted
From Canon 100 f/2.8L IS Macro @ 1:1 ratio (i forgot to turn off IS.. forgive the slight blur)
http://i105.photobucket.com/albums/m223/Jdmhoodz/IMG_5438.jpg
From Canon 135L f/2.0 @ MFD
http://i105.photobucket.com/albums/m223/Jdmhoodz/IMG_5439.jpg
From Canon 135L f/2.0 w/ 12mm tubes
http://i105.photobucket.com/albums/m223/Jdmhoodz/IMG_5441.jpg
From Canon 135L f/2.0 w/ 20mm tubes
http://i105.photobucket.com/albums/m223/Jdmhoodz/IMG_5444.jpg
From Canon 135L f/2.0 w/ 36mm tubes
http://i105.photobucket.com/albums/m223/Jdmhoodz/IMG_5445.jpg
From Canon 135L f/2.0 w/ 36mm + 12mm tubes
http://i105.photobucket.com/albums/m223/Jdmhoodz/IMG_5446.jpg
From Canon 135L f/2.0 w/ 36mm + 12mm +20mm tubes
http://i105.photobucket.com/albums/m223/Jdmhoodz/IMG_5447.jpg
YEah, it is quite the difference... but I thought about it... after tax, us prices into CAD, and shipping ... it would probably equal out to be the same, or almost.