Storage Questions Answered, Its Allocation Time..

For someone new to precious metal (bullion) - I'd like some opinions re: some basic questions
Assume 10 years to retirement and just some misc ( < 25 oz silver) in current holdings
Ignore 401k as alternative as I already contribute max before and after taxes (per rules of my company's plan)
In today's world, I could probably find $200 per week to invest - that would buy me 10oz of silver per week or 520 Eagles per year.


OK,
1. Although I believe that silver is more likely to head toward its historical ratio to gold prices, and NOT become the modern day aluminum (I'm assuming everyone here knows better than I why aluminum went from being almost precious to something closer to another recyclable, like cardboard - I'll suggest industry quickly finding itself with very cheap, almost limitless access to electricity .) So, should a precious metals portfolio focus on a single metal, or is there some accepted ratio of a handful of metals? (20% silver, 20% gold, 20% platinum, I'm just throwing out numbers, what is a 'smart' allocation?
2. As long as you avoid counterfeits, and deal w/ reputable dealers, are there any bullion coins that are favorites or ones to stay away from? (I don't need a lot of variety - I could be happy w/ nothing but gold and silver american eagles and Canadian maple leaf coins - does that makes sense?
3. Some rough arithmetic yields 10 years at $10k per year = $100k in metals, or, at todays prices:
a. 5k oz of silver, or
b. 75oz of gold, or
c. Some allocation of gold,, silver, platinum, palladium, etc.
Thoughts?