Got home this eve to be greeted by my housemate with the news that my 360 has croaked with a E74 (1422) error 
It's a early Falcon chipset model (with HDMI onboard) manufactured 05/10/2007. From looking around, it seems like the average repair cost is ~£50.
Is it worth getting it repaired? There is the risk I guess of it failing again relatively soon...
I have seen a brand new 250Gb Xbox 360 S for £166.66 via a well known online/high street retailer. I could get the dead one repaired and then sell it on. Do the high street stores that once could sell it to (the ''big two' plus cash converters) require you to tell them if you've had it repaired when trading it?
Just looking to weigh up all the options here...

It's a early Falcon chipset model (with HDMI onboard) manufactured 05/10/2007. From looking around, it seems like the average repair cost is ~£50.
Is it worth getting it repaired? There is the risk I guess of it failing again relatively soon...
I have seen a brand new 250Gb Xbox 360 S for £166.66 via a well known online/high street retailer. I could get the dead one repaired and then sell it on. Do the high street stores that once could sell it to (the ''big two' plus cash converters) require you to tell them if you've had it repaired when trading it?
Just looking to weigh up all the options here...