17201 is very buggy from my experience. 16454 is a lot better as ddns still works. since 14929 is still the recommended build i would not advise upgrading. however if you feel the need to, 16454 is pretty good.
I'm using different hardware so I can't say hot it relates to yours but I rather 17201 BIG (plus I can't really use much lower than that with the E4200 as it was released a little before then). I tried some of the other ones and I would just have crappy throughput even copying files from LAN.
I use this build on all my "working" routers. _________________ Wired GigaBit Backbone
Linksys E3000 K2.6 KONG-VPN 22200++ Gateway + NG & NA AP
Linksys E2000 (OC 500Mhz) K2.6 KONG-VPN 21661 VPN-Gateway
Linksys E3000 K2.6 KONG-VPN 22000++ NG & NA AP + VAPs