Try to use the train, not taxi, to go to SVO from MOW. The traffic could be terrible and 15+ miles from the city's center can easily take 3-4 hours. The train (Aeroexpress http://www.aeroexpress.ru/en/index.htm) is running from Bielorusski station (1-2 per hour), just 35 minutes to the terminal + 5-8 minutes walk.
You should be ~2-3 hours before departure at the SVO.

Also there are 2 new terminals in SVO and flights are still rearranging between them, call to DL (or KLM) to check where would be your flight.

MOW is awesome place, but do not be relaxed too much.