The DT-880 version '05 is more expensive and has a semi-open design, it has similar drivers to the DT-770 but it's semi-open architecture offers better mids and highs. The DT-880 is overall better than the DT-770 but exceeds your budget limitation.
I've lived in Paris for years, Magma is a good shop for customer service but damn too expensive.
I buy my headphones directly in germany through Thomann cyberstore , you cannot get better prices on the internet from an european store. i know some french "audiophiles" who also praise this particular german shop.
EX: AKG K701
Magma --> 329€
Thomann --> 211€
They give you 3 years warranty and payment can me made on delivery..
I also made use of Thomann's after sell service, which is excellent. i had to return my AKG K701 twice , the first time it was repaired and sent back in 5 days (including my shipment) and the second time they changed the headphone for another brand and refunded BOTH of my shippements. It cost me nothing, better, since the DT-880 was cheaper than the K701, Thomann refunded me the difference.
i don't work at thomann, but they made me a very happy customer by simply giving more than is asked for.