Sorry if you've seen this on another forum, but I thought this site would be a great place to get some answers. Thanks

Hey everyone i'm not sure if this topic has come up here in the forum or not. Excuse me if it has but i'm in the market for some new lenses. I'm a student photographer working my way into the profession. I have around $1500 to work with and i've been doing some research. I still have to do some research on used lenses that could save me money, but as my father would say its good to get things new with warreny. Anyways I think I may have narrowed things down to two choices, both orders from B&H. Here they are:

Canon 17-40 f/4L + Canon 24-70 f/4L
Both with basic circular polerizer and 3 or 7year Mac warrenty
shipped to my house would be $1,565.30 (and if bought by Jan 15th -$100 MIR) which brings it to $1,465.30 shipped.

OR

Tokina 28-80 (280 AT-X Pro) + Sigma 70-200 2.8 EX APO IF HSM
Both with basic circular polerizer and 3 or 7 year Mac warrenty
shipped to my house would be $1,626.02 (with $50 MIR for one of them forgot which) which brings us to $1,576.02 shipped.

Now i realize the obvious factors that the f2.8 would provide but i'm looking for some professional oppinon on chosing one for quality.I am a student and am not quite sure which part of the industry i'm most intersted in and will be doing a wide range of assignments, portraiture, nature, landscape, some photoJ, etc.
Looking for someone with experience with one or all of these lenses and some suggestion as to which way i should go. the 2.8 would be nice to have but would rather have a more reliable and sharp lens rather than just the ability toget good exposure in low light, tripods don't bother me and again i'm still a student, i'm no professional but am striving forward toward one profession or another. Thanks again everyone, I love this website!

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Justin Alessi
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CNY Student Photographer
Canon 20d, Elan 7n
Sigma 28-80 3.5-5.6II Macro, 70-300 4-5.6
Screw mount Fisheye