Need advice about a WiFi set-up

Dear Gang,
I want to have a pure 802.11n network using the 5 ghz spectrum and the wide array setting. However, I have one desktop computer that is 802.11g. I'd like to run a 25 ft. Cat 5 cable to one of the LAN ports on the TimeCapsule and then shut-off the WiFi on this computer. However, strangely enough, I've always had all my computers (even desktops) networked via WiFi so I don't know how well using the LAN works.
What are the thoughts of the group?
I know that ethernet should give me greater speeds to the TC's hard drive and should solve my problem with bringing a non-802.11n machine in to a "pure" network, but I don't want to do so if the set-up is arduous or if doing so makes me lose a lot of features that I get in an all WiFi network.
TIA,
Mark

dwb,
I'll definitely take your advice about the ethernet cables - thank you.
Your info is reassuring as it means that my dual G5 will get a little more life out of it by connecting it in to my "pure" system via ethernet.
Two other quick questions:
-should I connect my new iMac via ethernet to the router, too, even though it's capable of going on my system in 802.11n 5ghz?
-also, as an aside, I'm trying to figure out if my new 802.11n network will equal my current 802.11g network in terms of distance as I have an Apple TV that's a few rooms over. That Apple TV gets about 4 bars of signal from my current network. Do you think that 802.11n at 5 ghz will have an equivocal range?
Mark

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