I have the Asus (small townhouse and it's on a shelf so needs to look 'ok' for WAF) on the 100Mbps service. I haven't had time to do any testing but it seems pretty good. Note that it's a small townhouse though so any decent router is probably OK.
I have been told that using channel 13 on 2.4Ghz can improve performance (worth testing). If you have a dual-band router, I'm also told that you should set one channel as N only (I use the 5Ghz for that but note that some devices don't have 5Ghz radio). It does seems to be better.
Also, I suggest playing about with channel bandwith (eg, 20, 20/40, 40 Mhz).
Just my personal thoughts.