430EX, 420EX, 550EX and 580EX all support E-TTL II.. it's not cheap
for any situation, including CLS.
background, hair light, etc doesn't have to be high guide number
flashes, so the 420/430 can work fine there, but your main front
flashes should probably be the 580/550.
also keep in mind that MOST of canon's flashes are transister pack
upgradable which cuts the recycle time in half - very important.
nikon's are not. the little sb-200's that they rave about in that
article look neat and cool - but have a 7 second full pop recycle
time and no way of speeding that up.
The Canon system is alot more money than the Nikon system, here is a
senario where you can get (2) SB-800 and (1) SB-600 for $345 less
than (2) 580EX and (1) 430EX. and another senario with (3) SB-800
for $335 less than (3) 580EX. Part of the diferences is the fact
that Nikon provides wireless capability into the camera body of
camareas such as the D70/80/200/300 and for that ability on the Canon
bodies you have to purchase a ST-E2 Transmitter. Also the (3)
SB-800 kts system all come with a 5th battery pack and all capable of
additonal battery packs.
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(3) Nikon SB-800 Speedlight i-TTL
Total Price: $ 944.85
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or
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(2) 580EX II Speedlite E-TTL II
(1) ST-E2 Transmitter Kit
Price: $ 919.95 (B&H Kit price)
(1) 580EX II Speedlite E-TTL II
Price: $ 359.95
Total Price: $1,279.90
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or
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(2) Nikon SB-800 Speedlight i-TTL
Price: $ 629.90
(1) Nikon SB-600 Speedlight i-TTL
Price: $ 184.95
Total Price: $814.85
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or
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(2) 580EX II Speedlite E-TTL II
(1) ST-E2 Transmitter Kit
Price: $ 919.95 (B&H Kit price)
(1) 430EX Speedlite E-TTL II
Price: $ 240.00
Total Price: $1,159.95
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http://nickmjr.smugmug.com/
Nick M