System advice please

Hi,

      I would be grateful for advice on slimming down my system. I have brought various bits of kit over the years and now wish to get rid of the weaker parts of the system and make the best of what I have.

 AV

Samsung PS50Q97HDX/XEU 50” Plasma screen

Sony DVP-S725D, DVD Player

Cyberhome CH 4620, DVD player

Amstrad Sky digibox

Thompson Tivo

Bose CineMate, 2:1 speakers 

Sherwood RVD-6095 RDS, 5:1 Amplifier

 Hi Fi

Sony CDP-XA50ES, CD Player

Sony SCD-XE670, SACD Player

NAD C370, Amplifier

Rotel RA-820B, Amplifier

 Speakers

Eltax Liberty 5+, Main Speakers

REL Quake, Subwoofer

Eltax HT-2, Rear bipolar speakers

KEF Model 100, Centre speaker

 Connections

Ixos XHT 611, Scart cable

QED Silver Anniversary bi-wire, speaker cable

Cable talk Broadcast 3, Interconnect

Cambridge Audio Pacific, interconnect

Monster Home theatre power centre, Mains conditioner/surge protector

Any advice gratefully received

Cheers