It's a fallacy that you need to match router to exchange gubbins.
I'm not so sure now, having gone to an Infineon chipset modem on my TalkTalk LLU line:
Billion 7800N (Broadcom 6358)
Downstream sync: 15049 kbps
DS Attenuation: 27db
DS SNR: 6.1 db
Billion 7800N (Broadcom 6358)
Downstream sync: 17849 kbps
DS Attenuation: 27db
DS SNR: 3.0db (tweaked)
Linksys X2000 (Broadcom 6328)
Downstream sync: 15990 kbps
DS Attenuation: ? db
DS SNR: ? db
Draytek 120 v2 (Danube Infineon)
Downstream sync: 17571 kbps
DS Attenuation: 29db
DS SNR: 6.2 db
The Draytek's been rock solid so far (connected to Linksys EA4500) so going to stick with this for the time being. From the top of my head other Infineon routers include netgear DGN1000, DG834G (some versions) and if money isn't an object then go for Draytek 2820 or 2830
Having said all this, if i was on a long line ( atten. >50db) then wouldn't use anything other than a Broadcom router purely for line stability.