My graphic card is powerfull enough

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To my surprise, my AMD Radeon 7970 is well enough to play that game at 60 FPS, with High settings. It gets a little lower when I put Ultra settings though...

I play on PC with a Logitech G27. I plan tu purchase the G29 in a few weeks.

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The G29 is just an updated G27. You could buy a T500RS for about the same price.

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ReVengeance said:

The G29 is just an updated G27. You could buy a T500RS for about the same price.

I don't like the shifters not attached to the Wheel, nor usefull when shifting in a curve.

How about the FFB in F1 2015 ?

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I haven't got F1 2015 yet, as I'm waiting for the bugs to be fixed.
The FFB on the T500 is pretty good though as it uses a direct drive motor rather than helical gears. The lack of shifters on the wheel is annoying to start with, but you do get used to it. 

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The bugs are limited to the minimum after the 2nd patch. I really enjoy that game.

Go for it...!