RJ is mostly relying on the A320 for their european operation (FRA, BRU, ZRH, LHR, CDG, ROM, MAD..). The only 742 was finally sold (it was a desaster cost for them). As far as i know they are trying to get new airbuses. It should be either 330 or 340 to replace the Tristars 1011-500 which they still deploy on BKK, MNL and SIN route and sometimes even JFK and ORD. They should get ride of the A313, it's a very expensive aircraft especially when the cargo utilization is low.
P.s what do you mean by DHC 8 (DC8??) they don't have any!