That's a sweet system man.
I would recommend a different water cooling setup, I've read many of threads that have people complaining about their Thermaltake water setup leaking. SO just be careful.
But you could put together a QUALITY water setup for fairly cheap, and it would probably cool better, and you would have piece of mind too.
You can use a different block, it will come with barbs that you need more then likely. As long as you use non-corrosive mix, you'll be fine.
And mounting a water block does not void the warranty. If anything happens, you'll have to take off your water block, and at that point they have no idea what you were using for cooling.
And I just read a post yesterday that had a guy clocking his E8600 past 6.5Ghz.
Of course he upped the v-core, but that's impressive.
And welcome to TechIMO.
