If your concern was really about securing the network (as opposed to profit), you would just buy some ASIC Miner shares at an amount you could afford, or even some of the escrowed group buys that people on the forum have been advertising. Then your money is going toward increased hashing. I suspect you just want to make a ton of money though, and are bitter that you can't afford to buy an ASIC of your own. Am I right?
Sorry to "intrude" but IMHO your missing the point. The network didn´t grow and prosper because of a few "investors" with enough money to take over a considerable amount of combined hashing power. As far as I know, one of the core principles of Bitcoin is the ability of as many participants as possible - the more the merrier. No trust issues because of the big big numbers of participants. The chance to earn new coins now and to earn from fees later. No centralized control. No centralized power over the currency.
When participating with CPU - no problem. Anyone with a computer could participate without considerable cost.
When participating with GPU - no problem. Anyone with a newer computer could participate without considerable cost.
ASICs are not only a completely new game, it´s completely new sport.
When buying shares from whoever, there is nevertheless a centralized huge hashing power beyond the control of many.
When buying ASICs now because of deep pockets of a few and profiting huge in the coming few month and "reinvesting" that money after massiv increase of difficulty bears the risk of centralizing instead of decentralizing.
A lot of people (and I assume the creators of Bitcoins) wanted a currency that depends NOT on the decisions of a few. You can call this "few" government, feds, Bundesbank or Oligipoly of rich ASIC "investors". Bitcoin is more than a network, more than a way to print your own money and more than a kindergarden of tech-freaks. If the community doesn´t respect the principles, Bitcoin will go down the road of any actual currency. I don't want a "FED" consisting of a handful of miners with hashing power no one with a computer can do anything about.
I trust a network build of thousands of family men with a computer a lot more than a network of elite ASICs.
No offense - just my two cents.