I am assuming you want to replace the Silverlines with small towers. I suggest you check out these front ported models:
-Aperion Audio 6T (Internet direct),
-B&W 683 (big),
-Focal 816V,
-Monitor Audio Silver RX8 (new product), and
-Rega RS5.
Three other speakers I really like in this price range are the Epos M16i, B&W CM7 and Quad 22L (a bit boxier but very sweet), but these are rear ported and may require placement a bit further into the room, or muting of the port with a plug.
-Aperion Audio 6T (Internet direct),
-B&W 683 (big),
-Focal 816V,
-Monitor Audio Silver RX8 (new product), and
-Rega RS5.
Three other speakers I really like in this price range are the Epos M16i, B&W CM7 and Quad 22L (a bit boxier but very sweet), but these are rear ported and may require placement a bit further into the room, or muting of the port with a plug.