Above build is nice i would reckon wait 2 weeks (19th ithink) for the new proccessor, i7 4790k, its alot more powerful.
Other than that i would grap a better monitor , will help both with 3Dmax and gaming.
If would need to save money from the above, you can grab a slightly cheaper case, 240/256GB ssd is more than enough and 3TB hdd is a tad too much 1.5-2TB would still be alot to have.
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What i had in mind, thats under 2k in euros for sure, unless in France parts are so much more expensive than the rest EU:
No both mobo's are good to go. Only thing you would need to do is to get the new cpu in those builds.
As far as the gpu's go both are powerful. The 780ti is more powerful than the R9 290 and more expensive too. I just put it there cause it fits the budget. It depends how much 3d heavy stuff you do, is it a hobby or pro work? Does it pay your food/bills? If yes then why not. So it really depends i would say.
To me it seems more beneficial to try and save a bit from here and there, like mobo-ssd-hdd-ram without loosing performance and throw the money to a better gpu.
Also either way i think a good monitor will help you.