Front speakers are 30+ year old Kef C40, surrounds are Wharfedale Valdus 100, centre Cerwin Vega E 75C. No sub at the moment but looking at a Velodyne Impact 10 or Wharfedale SW150 Subwoofer (any suggestions on these?)
Pannasonic DMP BD65 Bluray Marantz CD5400 CD player MacBook for MP3
Cool - the Marantz is 50W per channel, seems low, but truthfully, Marantz don't exaggerate their RMS figures like some other manufacturers... I'm not 100% on the specs of your current speakers, do you have their specs on-hand?
How are you looking to connect your Macbook? Via optical?
I do like the Velodyne subs, the Impact 10's are well regarded by many people, so it should treat you well.