Only 5-10 coins? I thought that was riffraff.
100 coins minimum.
Edit:
On second thought, no one with any real amount of coins would keep more than a couple dozen in any single wallet.
10 coins it is I guess.
100 coins minimum.

Edit:
On second thought, no one with any real amount of coins would keep more than a couple dozen in any single wallet.
10 coins it is I guess.
by latest estimates, there are less than 10,000 wallets with more than 100 btc.
I saw the edit.
So the best option can be 20. But if you look really 5-10 is not so much.