Quote (Antichrist- @ Jan 19 2011 01:12am)
hard to say between 24-70 and 24-105. 24-105 lets 1 stop less light in, but it has at least 2 stop IS(at times it can even help 3 stops) and you can get higher magnification. 24-70 has slightly better iq, but a good copy of 24-105 has nearly the same iq. 24-70 has bit better build quality, but what i find really annoying with it is that it gets long when you use the wide angle and gets short when you use the longer focal lengths(pretty weird huh?). 24mm isnt all that wide on 1.6 crop sensor, so id rather go with 18-50 2.8 IS, unless i had some ultra wide angle with it.
whether you should stick to primes or not depends if you need a zoom or not. personally if i had a 1.6 crop camera i would most likely go with 18-50 2.8 IS, 28-30mm prime(canon 28mm 1.8 or sigma 30mm 1.4), 85mm 1.8 and 70-200(canon f/4 IS or sigma 2.8). if i went with the 70-200 2.8 sigma i would most likely drop the 85mm off since 200mm 2.8 is good for portraits too.
I shoot all types of sports, a 70-200 would kill me when I shoot basketball!

I think I'll do this...
Sigma 70-200 f2.8 II (Seems to be much better in IQ than the Mark I, also has macro)
Canon 24-105 (Walk around lens)
And an ultra wide.. I plan to go to a full frame some day and I want to be able to bring my lenses with me, so I'm thinking the Sigma 10-20 f3.5 or a Tokina 11-16 f2.8. Or is there something else I should look at for ultra wides?