Personally American Coins always make me smile given I love the place so much, but their is no denying that the Philharmoniker is a beautiful design. Thing is though, you get the same design on silver Phils, but different design between ASE and AGE so if you are destined for one these pair I say go with the US coin.
If you want other suggestions, my personal favourite choice would be 8 or 9 Gold Sovereigns, as you get greater liquidity down the line as prices go up, the chance to grab a range of dates, and the satisfaction of a nice little handful of coins.
Even better would be 17 or 18 half-sovs if you can stomach the premium.