TRAVEL+LEISURE - 11/10/00 The Internet's Best Travel Sites ...Our advice? When price is an issue, try a consolidator. Hotel Reservations Network (www.hoteldiscount.com) stands out for its broad selection, ease of use, and savings ($276 at the Mondrian in L.A., for example, compared with $310 from the hotel). With the recent addition of 15 destinations, HRN now has rooms at 2,000 hotels in more than 75 cities across the United States, Canada, and Europe. Select a destination on the home page, and ask to see only those hotels that have rooms for the dates you need; search results include the hotel's exact location, its type, and the price...