DSL-AC68U I would leave alone as it uses a MediaTek based DSL chipset, and can be troublesome, and I do not think supports Option 61, ?
Draytek are great routers, but more aimed at business and the interface is tricky for the averidge user.
Billion, used to be great, but clunky interface from what I read online.
For you I would opt for either the …. both support Sky MER and good value.
- NETGEAR C7500
- TP Link vr2800
The TP-Link is the safer bet especially given the Sky Mer requirements and looks good also, but like most things made in that region, can be troublesome (wifi) but given the price, a good all rounder at a fair price 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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