After an appropriate amount of analysis and learning what my options were, etc, I've chosen the following option:
Total Cost $5,966:
- Lennox 5 ton14 seer system (14ACX)
- Lennox 5 ton 90k BTU Horizontal Gas Furnace (ML180)
- Lennox 5 ton high efficiency evaporator coil (CH33)
- plenum transition, freon line set flush, prog thermostat, freon, line dryers
- 10 year parts warranty, 1 year labor
Thanks for all the help to those that offered their insights and expertise.