Carrier's Performance 17 AC is just fine. Warranty is same and this condenser is compatible with Infinity Controls.

See below

24APA7
Performance
Efficiency Up to 18 SEER
Limited Warranty 10-year parts limited warranty when properly registered1
ENERGY STAR�
Details All Carrier air conditioner products achieving system combinations of 14.5 SEER and 12 EER or higher meet the ENERGY STAR guidelines for efficiency. Proper sizing and installation of equipment is critical to achieve optimal performance. Air conditioners must be matched with appropriate indoor coil components to meet ENERGY STAR criteria. Ask your contractor for details or visit the ENERGY STAR website.
Sound
Quiet Level2 As low as 69 dB
Features Silencer System II
Controls
Controls Supported Infinity� control, Edge� and Comfort� 2-stage thermostats
Diagnostic Intelligence Enhanced diagnostics with Infinity control
Technology
Refrigerant Environmentally-sound Puron� refrigerant
Compressor Two-stage Scroll
Cooling Capacity (tons) 2 - 5
Pressure Switches High and Low
Aesthetics
Protection WeatherArmor�
Construction Galvanized steel
Paint Baked-on, powder coat paint
Coil Guard Steel, louver Coil Guard
â Back to Top

IMO

Here is a link that might be useful: CArrier AC comparison

I also agree. The 24ANB is not worth the extra $2400. I live in central NJ and have a very similar set up. You will be very pleased with the comfort level of the Infinity furnace and AC in summer and winter.

Thanks for the feedback. I am going to go with the Performance Series. Have a great thanksgiving.