Looking at upgrading to Gigabit Internet(questions).

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I'm looking at upgrading to Gigabit Internet and had some questions for the even more intensive tech. people here, at least in terms of networking. So Piper and others..
First, is CAT5e cable backwards compatible with CAT5 devices if they don't support 1 gb. ethernet? I'm looking at my PS3 and on the Wiki page it says that it supposedly supports 1 Gigabit internet but it's Wiki. I'd just use CAT6 to futureproof it all but I get the impression it wouldn't hash with non-gigabit ports.
Additionally has anyone here used an Xbox one with 1Gbps and what has your experience been?

Lastly, two questions. If I had a choice between a device with N-wireless but only 100Base-T wired which would you recommend using? Also, this dovetails into my last question which is what router would you suggest buying? I'm looking at not just connecting in some consoles but there are tablets and phones around too. I'm thinking AC but some of the devices I think are g and below so will splitting the signal and sending those to the 240 MHz be fine or will it effect the speed adversely instead of proportionately?

Sorry for the mouthful Piper and others.

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