What he said.
But I only use Cydia for tweaks and such alike.
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I go Android so I don't have to deal with most of that stuff. Haven't really felt the need to root it. I can tether with EasyTether so I don't have to pay Sprint for the privilege.
I have a co-worker that seems to be in the ROM of the week club. It's a smartphone to me, not a hobby.
The most I dabble in that stuff is loading Cyanogenmod on my HP Touchpad to dual-boot with webOS.
You have broken the first 2 rules of ROM club. :D
If you're installing Appcake, first install appsync 6.0+ then add the source cydia.iphonecake.com.
Navigon is a great GPS app that doesn't require internet/data.