What is the significance of starting the coinbase at 17.76? It's obviously not arbitrary. Also, is your decimal place going to be in the same place that Satoshi placed his? That was an arbitrary choice on his part, and may not be what you wish to do.
The total quantity of coins is insignificant from an economic perspective, all that matters is their ratio of production, so I chose 17.76 simply because it works just as well as any other number, but has a symbolic purpose. I want every possible part of the coin to have purpose, even if its purpose is simply symbolic. The genesis block's message is currently a re-iteration of the first lines of the Declaration of Independence, but replacing the original word "governments" with "money and banking", which follows the theme of secession. This is simply a gimmick to attract attention from more mainstream sources as the powers that be will have a hard time opposing this theme, not to mention that crypto-currencies are in fact a secession from central banking so the syllogism is apt.
Regarding placement of the decimal point, there were only two issues I considered, although I may be missing a technical issue. First, because the coin is trying to maintain stable value after its first few decades of use, users would not have to constantly divide the coin into smaller portions over time, so I did not have to worry about the economy outgrowing the limit of the coin's divisibility. Secondly, I had to decide what value an individual coin would have if it became adopted as a major currency. This has no economic effects, but may speed or slow its adoption by certain groups based on biases towards high or low values for a single unit of currency. I chose a number that would maintain a much larger value per unit of currency than the current dollar scenario, because I thought it would be more appealing to fans of existing crypto-currencies and the initial push is the most important stage for a crypto-currency.
If there are other problems associated with the decimal point I am unaware of them.