Carrier Infinity Furnace

What's the scoop on these heaters? After looking at other brands they seem to be the best. But I hear there is a $800 premium on the Infinity versus standard installations. It appears besides the Buck Rogers monitor panel the big difference is the variable speed DC fan motor and better humidity control. Is it really worth it? Is there any real life advantage over the Performance series?
Boggled minds want to know.
Thanks in advance.
Ashley...
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Go with a 14 SEER with variable speed air handler and matched Thermidistat...

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