Here is a question to ask you...Do you plan on over clocking them? If not Intel creates their processors to withstand the heat in generates as long as you are using an approved heat sink and fan. I know having a system cooler is better, but if you are not going to over clock the processor than you would be wasting money. As for your concern fro the leaking issue, anything can break, however, the stories you may have heard, the people probably did not install them properly. I had a water cooling kit and the hoses are very strong and the attachments are very secure, but don't buy a cheap kit, the saying "you get what you pay for" is true to water cooling kits.
-Kerry
Those that know, do. Those that understand, teach. -Aristotle