Mk2 Escort Heater cores

What have others done - are there any late model alternatives?
I have 3 heater cores and all are original and need to be repaired which I have been quoted maybe $150-200+ to repair and $400 for a completely new core using my original tanks!
A couple of options from the UK being:
https://www.ebay.com.au/itm/163526592689?ViewItem=&item=163526592689#shpCntId
https://www.ebay.com.au/itm/FORD-ESCORT-MK2-HEATER-MATRIX-NEW-76-TO-80/253400286140
The first looks to be manufactured as per the originals with copper and brass materials.
The latter is a more modern approach with alloy core and plastic tanks.
Given the considerable price advantage I'm inclined to go with the latter - anyone have any experiences with either?
 

I stuck a caravan electric heater in my mk1 van , and didn't want water cores in the cab. I pulled the unit apart and and fitted the heater elements and fuses etc. Also ditched the fan in favor of a Gixxer 750 radiator thermo fan, nice and flat n quiet except it sends the dash vents out the back doors on full speed !!

As for replacement cores, I was looking into Sierra ones, but have used TF Cortina ones as they are wider and crank heaps more heat than escort ones, highly recommend them , only slight mods to the heater box and your good to go..

Be careful, if it is made in china it may cost $500 in headaches *when* it springs a leak.
:)

Thanks guys.