I know what you mean about the SAR110. Ive never yet come across a home router that has so much and so many configuration options. I stuck out with mine as long as I could despite it looking like a brick and not being wireless. Same chipset as the Voyager 205s which wasnt a bad router underneath the BT GUI.
AFAIK I was the first to realise that the SmartAX was basically similar to the SAR110 and I did at one time have a couple of them. I dont know if the same is true today since this must be about 3-4 yrs ago now and there will have been firmware updates, but if you can ignore the TT GUI.. I found that under the hood the CLI was remarkably similar. However if youre going to have to mess with the CLI, this takes away a lot of the advantages that the SAR110 had for filtering etc and how comparatively easy it was to set these options.
Globespan Virata was taken over by Conexant a few years back so Im not even sure if you will now be able to get something similar.
IMHO I dont think they are quite as good as the ST585v6 or the DG834GT for stability on long lines. A lot of router manufacturers seem to be playing to certain ISPs these days and making them very basic when it comes to configuration options.