Since your goal is to accumulate an inheritance for your daughter, you'd probably be best off stacking low-premium bullion. ASEs, CSMs and Philharmonics can be bought in the US for reasonable premiums from Goldmart and Provident. If you prefer generic bars, I don't think anybody beats the Goldmart premium on 10oz NTR bars. If you have any good LCS's near you, they may have good premiums ($1-$1.50/oz) on secondary market generic bars, but watch out for sales tax.
Numismatic stuff costs a lot more than low-premium bullion. It may appreciate a lot better, but it might not. You never know and market trends are unpredictable,very fickle and not really the stuff of stable, sound, long-term investments.
I'm also trying to build an inheritance stash. I've stuck almost entirely with low-premium bullion (ASEs, CSMs, Philharmonics and Libertads). The furthest away from that principle I've wandered is a small amount of semi-numi bullion (Engelhard bars and a complete set of silver bullion Britannias), so what I've accumulated is steady and solid value stuff that won't be heavily influenced by the comings and goings of numismatic popularity and premiums.
But -- bottom line is it's your call. Good luck.