3 New Gold Pieces

This is unfortunately not always true. Although I know coins92 to be an astute buyer, it's been our distasteful duty on many occasions to inform new members that they've just horribly overpaid for the coins they've purchased. The ability to grade is absolutely essential in order to determine a fair buying price, and people sometimes put the cart before the horse in this regard.

I see just the slightest bit of circulation on the St Gaudens, although in the bright light, I could be mistaken.

The Eagle is a bit washed-out for a conclusive opinion, although to my eye it's Mint State.

Likewise the Quarter Eagle; the pics are again a bit bright but the luster is obvious.

I'd guess the 1908 Saint is AU55 with $1400 being a good price these days.

The 1887-S $10 piece looks MS in the pictures. This coins jumps way out of the bullion price range when it hit MS63 and may be one to certify.

Your 1899 quarter eagle looks MS also and, like the $10 piece, gets very pricey at MS63. It might be worth certifying as well.

If you could remove the $10 & $2.50 pieces from the holders and snap some pics without a flash we'd have a better idea. The last 2 look like real prizes from here!

I think it depends on the intent of the purchase as to whether you over or underpaid. If your intent is simply to add coins to your collection for your own enjoyment, and not for investment or profit, then it's difficult to say that someone "overpaid" since they simply paid what it was worth to them. However, if the intent is for investment, hedging and/or profit type purposes then one could certainly "overpay", or "underpay" for that matter.

When making thousand dollar + purchases, it is much harder to simply buy a coin without factoring in the potential resale value(unless you just have tons of money to waste).

nice coins, you must be knowing the price what you paid for them, I bet you would not have overpaid. so relax , if you want to grade them, give them to a professional.