Lord Logan - You'll love the inspire. And fees should be minimal if any.
The Inspire is a very Good phone, the only other phone i would consider is the Captivate.
The Captivate has a 4" AMOLED screen, Hummingbird 1ghz processor, and 16GB memory. Relative to the Inspire, the Captivate has:
Better:
Faster GPU
More Flash
More Application Storage (2GB vs about 512MB)
AMOLED Clarity and viewing angles
Plays more types of video & audio, and features a stellar audio chip.
Slimmer build, smaller build.
Worse:
Smaller display (this may be better if you prefer 4.0" to 4.3")
Slightly lower effective resolution (around 640x400)
No HTC Sense UI
$99 new instead of $69 new
They are both even competitors. They both are stupendous phones and it really comes down to the details. For me the biggest advantage is the storage; the Captivate comes with 16GB of it, with 1.5GB available out of the box for applications and 13.5GB available for media. The Inspire comes with 512MB out of the box for applications and about 3GB for multimedia. Both are expandable, with up to 32GB of additional storage available. The Captivate even lets you swap microSDHC expansion cards with the phone on, allowing effectively unlimited storage.
So anyway, i would recommend carefully weighing your options. They both rock as phones, and i've used both.
As far as fees, i believe AT&T charges no fees specific to a family plan, but prices can be different for the phones. Whatever price is quoted when you choose to upgrade your line is the correct one, most likely.
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