shimano or mavic?

duracer
duracer Posts: 17
edited October 2009 in Pro race
i have to make my choice between:

1.: budget shimano WH RS 20 - stainless steel spokes, steel non cartridge bearings,
2.: shimano WH SR 80 - $500 - stainless steel spokes, steel non cartridge bearings,

3.: shimano dura-ace WH 7850 50 mm carbon rim, only rear wheel,
4.: shimano dura-ace WH 7850 SL, only rear wheel,
5.: mavic ksyrium SL premium, QRM + cartridge bearings, only rear wheel,
6.: mavic cosmic carbone SL, only rear wheel, steel spokes?!

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