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So you want both a currency that has the hallmark feature of not being concerned with exchange rate (
B) and a currency that has investment appeal (
A)? Are you sure you aren't mixing up currency as a unit of exchange and wealth/savings/investments as saved capital surplus?
Realize that A comes before B. B is the goal, where at which time A cashes out without ponzi crash, because B supplies demand. This is accomplished by raising transactions to a very high level early with PC mining.
You can't have high level of transactions at an early stage because it's an early stage. So you've arrived back at bitcoin. Currently it is in stage A. Possibly it will get to stage B.