Personally I wouldnt buy a 10 oz bar, because if gold does goto $3000 and you want/need to sell it for whatever reason, not many people will have 30 grand at hand to buy it, unless you sell it back to the mint but then you will pay capital gains tax and there will be a paper trail to prove it
For instance if you had 10 x 1 oz bars you could sell one if you were in a pinch financially etc
Im sure you would have thought of this before such a big purchase but in case you didnt its something to take into account for liquidity purposes