Hi reaper23,
Yes, we are aware of the Corsair products, and no, it does not equal a custom cooling loop. It does use some good components, but by nature, it is a closed loop and has limited thermal capacity (IIRC, it uses a heater core fitted to a 120mm fan, and the fan can be set to two different speeds). Once you hit the thermal wall, your temperatures will creep upward until you have a boil-off. Your processor will be dead well before that point, though.
That is why it is always a good idea to have too much radiator in your loop rather than too little. In essence, unless you are willing to invest in a custom loop, or you can buy a pre-built kit that has a higher thermal capacity than your computer (which would be a bit more expensive than a custom loop), you are better off sticking to high-end air cooling.
Good luck with your H50. It is a good place to start getting your feet wet in water cooling without actually having to jump into building your own loop from scratch. But if you are expecting performance any better than high-end air cooling, you will be sorely disappointed with your results, since you can get the same or better performance for half the price from air cooling. But if it leads you into building your own custom loop, chalk up the expense to a good start to learning how to water cool.