5D3 + 24-70mm Mk I for 2 reasons (both economic or related to re-sale:
(1) 24-70mm mark 1 lenses have already begun to appreciate considerably in value, plus the price differential btw the mark II and I is still huge - can only compress from here (as new lenses are discounted by retailers, particularly the online variety, whereas the limited availability of older mark I ones will ensure a high resale value).
(2) The 5D3 has much better AF + low-light ISO performance (12,800 is 100% usable - see Philip Bloom video review on D4 vs D800 vs 5D3), and has dual memory cards, faster frame rate etc. Rule of thumb is to change your DSLR body every 2-3 years, but retain your good glass, so you won't lose much when you trade-up again.
Based on the above reasons, mainly the first one, it will be more cost effective to get the newer body now with the cheaper L lens, only to trade up from the mark I to the mark II in about 6-9 months time when the price differential is not 50% more but 20% more (or even less). Think about it.