This is an entry level receiver with max power of 70 watts per channel, two channels driven. Look for a 5.1 set of small satellite speakers with a sub. That is all you need. Look for speakers that have high sensitivity.
There is a huge list of manufacturers. Go to local stores and see what is available.
Pioneer SP-PK22BS Andrew Jones 5.1 Channel Speaker Package
Definitive Technology ProCinema 600 5.1 Channel Speaker System