Mini Lore monitors.
Tekton are the high value choice. These are 95dB. What that means is they will sound good and play quite loud even with a fairly low power 20wpc amp. It is kind of pointless trying to fill a large room with bookshelf speakers. Much better to max out on what you can, which with these and a nice little tube amp you can get quite good sound when sitting near, and positively passable sound everywhere in the room all other times.
That old amp will probably be next on your list to upgrade. Buying high sensitivity speakers now will make amp selection later a whole lot easier. You could for example get a little Decware 6w amp and be happy as a clam with sound like you probably never heard before. System building. Way to go.