Re: Bike Choice
The Pacific makes a decent motorbike even without a shift kit, which I would not recommend for any new builder anyway. The gearing is still useful even pedaling and you get better brakes as well. Just do the usual chain store bike maintenance like greasing and adjusting all the bearings and true the wheels if needed (usually is...).
The geared bikes tend to be a bit better quality than the Cranbrook with better aluminum rims and three piece cranks.
Wait until you have more experience before you tackle a shift kit build.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.