Now that I have got to grips with my current ET8500 box and have acquired a second box (Octagon SF128) I have made the brave decision to reconfigure the house

My setup is as follows:
1 Large 3 LNB dish pointing to 19.2, 13.0, 28.2 with one cable coming into the house to living room.
1 sly dish with 4 cables coming into the house (2 to living room & 2 to son's bedroom)
1 aerial
sly box in living room
sly box in son's bedroom
youview box in main bedroom
cables running under the floor:
living room to kitchen
living room to main bedroom
living room to son's bedroom
ET8500 (1 x DVB tuner, 2 x sat tuners) in living room

And what I want is:
Do away with sly boxes.

So what I thought was:
Existing ET8500 moved to son's bedroom
Buy a new ET8500 with 4 tuners (1 x DVB and 3 x sat tuners) for the living room.
'Daisy chain' the Octagon from the living room box in the kitchen (as per twol's suggestion).

So I guess my options are many,
do I buy another Xtrend (1 x DVB & 3 sat tuner) for the living room and move existing ET8500 to son's bedroom
do I just buy another sat tuner for my existing ET8500 and buy a different box for son's room (1 x DVB and 2 x sat tuners)

Should I stay with Extrend or is there anything better (or is it all down to preference)