Now maybe that SB 6120 will be put to good use now? 
Indeed!  It's been up and running since I got it.  Now, hopefully we'll get the most out of what it's designed to do.  It has 4 channels for bonding, right?  The Ubee (Ambit) I got from Charter has 6 channels.  I may try it out tomorrow and see if all 6 channels bond.
I'm currently trying a Buffalo router, btw.  A $16 refurb from ecost.com WHR-G300N model  

I had a lot of trouble setting it up but found the issue and then it found the DHCP IP addresses and came right up.  It's a little better than the DIR-601 only because with the 40MHz channel I can get 300 MBps transfers.  I don't think the 601 gives that option but still has been a solid performer.