Ask a Lineman if copper or aluminum is better. Aluminum has a place in the electrical industry, but IMHO it shouldn't be used for premises wiring (as a general rule, there are exceptions). Overhead service drops, high voltage transmition lines, any application where weight is an issue, etc, etc, knock yourself out. I believe the thing to keep in mind is that we wired houses in aluminum back in the 60's and 70's, and it turned out to be a big problem that we are still dealing with.
Which brings us back to Mr. Damon. Look at the application, and then get on the horn to your supplier. Tell him the situation, and discuss your options with him. Some parts of the project may call for wire nuts with "pooky" in them. Other parts of the job may call for CO/ALR devices. Remember the NEC:
110-3. Examination, Identification, Installation, and Use of Equipment
(a) Examination. In judging equipment, considerations such as the following shall be evaluated:
1. Suitability for installation and use in conformity with the provisions of this Code
FPN: Suitability of equipment use may be identified by a description marked on or provided with a product to identify the suitability of the product for a specific purpose, environment, or application. Suitability of equipment may be evidenced by listing or labeling.
2. Mechanical strength and durability, including, for parts designed to enclose and protect other equipment, the adequacy of the protection thus provided
3. Wire-bending and connection space
4. Electrical insulation
5. Heating effects under normal conditions of use and also under abnormal conditions likely to arise in service
6. Arcing effects
7. Classification by type, size, voltage, current capacity, and specific use
8. Other factors that contribute to the practical safeguarding of persons using or likely to come in contact with the equipment
(b) Installation and Use. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.
The Watt Doctor