By Alla Startseva Jul. 10 2002 00:00 Moscow is the most expensive city in Europe for those who want to maintain the cushy standard of living that they are accustomed to in the West, according to a new survey.Ramstore is the cheapest supermarket that stocks the imports foreigners want, while Sedmoi Kontinent is medium-priced and Kalinka Stockmann is high-end, according to the annual survey by the G