^some very sound advice, i'd say (ha, no pun intended:p). The upgrade-one-thing-at-a-time method is a good way to go, but just know that you won't be getting near the best you can with your Onkyo, so it should be on the planned upgrade path. The local MAV has their 802D powered with Mcintosh MC601's and they sound lovely to say the least, lol.
ht Panasonic 60" ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Sony KDL-32W650A, Sony BDP-S1000ES, Marantz PM8004, JVC T-X3 tuner, Monitor Audio Silver RX1, REL T3, Apple TV, Peachtree Audio DAC•iT, Sennheiser HD598
lr Panasonic 50" ST60, Sony BDP-S5100, Apple TV
pc Energy CB-5, Audioengine D1, FiiO A1