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Welcome!- What region are you located?
Whats GIGe? All the routers I've tested have worked well, including the cylinder style. They actually work better than box style. Do you need or think you will have a need for both 2.4 and 5Ghz radio?
Please review the DIR-865L, 868L and 826L that I did in there perspective forums.
http://forums.dlink.com/index.php?board=392.0http://forums.dlink.com/index.php?board=325.0http://forums.dlink.com/index.php?board=346.0There will be differences as the 4100 has become out dated and no longer in production and development. Newer features and WiFi are major differences.
If your still interested in the box style, I recommend checking out the DIR-835, or 655.
FYI, All 8 series routers are mostly dual band routers. All 6 series routers are mostly 2.4Ghz only routers.
The DIR-665 is no longer in production. The DIR-825 and 655 are still in production.
If your wanting to keep with the DGL series, the 5500 is pretty good.
http://forums.dlink.com/index.php?topic=55136.0I wish the 4500 was still around. You might find a good used one on fleabay or amazon though.
Let us know if you have any more questions or what you decide to go with. I'm enjoying the D-Link line of routers.