Bit surprised about the Netgear :/
The HH may have just "hit lucky" - SNR varies throughout the course of the day.
Your best bet of attaining the best sync on long lines is normally during the day rather than evenings when SNR is normally at its highest.
>> 2-wire 2700
I have heard some good reports about them, but have never personally had my mits on one - but I believe that theyre not available for retail sale in the UK and only via an ISP (BT)?
Perhaps your best bet would be buying from somewhere that allows a money back return in case you have problems. (such as Argos).
Other routers that seem to perform well on longish lines are Voyager 2100/2110/2091 and most of the speedtouch routers.
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One other option that you could perhaps also consider if the 210 really is the most stable then you could try something that Ive done before :-
Continue to use the Voyager 210 as the "main router" handling your connection... then hook up another router to the ethernet port in the 210 making the new router work as a glorified Wireless access point.
Takes a little bit longer to configure since you have to turn off DHCP on at least one of the routers.
(I prefer to turn off DHCP on both routers and manually set the IP addresses on the local machines but thats optional).
You can buy Wireless Access points that you could hook up to your existing router... but when I was looking at this option, it was just as cheap to buy another router and use that