Rather than buy bullion, I would buy gold coins from the US mint. They are selling 2009 double eagles which are priced a hundred to a hundred and fifty over the spot price of gold. The mint usually stops production after a year and the value of these coins have gone up. I bought a 2008 Buffalo and two 2008 uncirculated gold coins from the mint. A 2009 gold eagle is on order. I would not buy coins or bullion from an individual. The price stability of coins is better than bullion in my opinion. BTW, only buy American gold coins.
Kitco would be my choice for bullion. They have pool accounts where you can buy small amounts with them. Rather than take possesion, they stay in their vaults at no charge to you. At any time you can sell the gold, silver, platinum back to them at a very small discount or you can have it delivered to you. You have to pay a processing fee along with shipping and handling. You can buy in any dollar denominations rather than specific weights. By building up a larger quantity, the processing fee and shipping is lessened when you decide to take possesion.
If you chart the price of silver and platinum opposed to gold, you will see that gold is approaching it's highest level whereas silver and platinum is only one half the way of achieving their highest level rate. They may be a better investment than gold.