Even the aquarius can easily be outperformed.
I've been hanging out at xtremesystems a lot gaara so I basically know whats the hot items among water cooling.
Is it worth it? If you get the right parts it sure as hell is. Not only will it of course be a lot quieter, you will most definitely get better temps. I have indeed set the bar high with the SLK-900A in my particular system, but I believe if I had done more research I could have beat it.
My tornado currently will let my CPU get up to anywhere between 42-45C full load depending on how how it is in the room.. This being at 1.9vcore
Is it easy to set up? You betcha....the key of course is doing a 24 hour leak test and being PATIENT most of all. Check and double check your connections. Use the right liquid (generally distilled water with some Zerex which can be found at places like autozone) can heighten your chances of your components still working even after a leak. Distilled water (as you may know) is non electrically conductive because all the crap that isn't water has been taken out. Zerex basically will preven rust, corrosion, algae, and bacteria from forming in your solution.
You'd want about 90% distilled water and 10% of zerex for a good balance.
Danger Den TDX Block
302 "Weapon Core" (Weapon is the name of the guy who mods a 2-302 1977 bonneville heatercore, yes when I say 1977 b-ville I mean one from a car hehe. He mods them with slightly bigger barbs than the normal biggest tubing which is 1/2" tubing. This provides more flow obviously through the core. He also custom CNC's the shrouds for two 120mm fans. You'd just go to xtremesystems.org and PM him for pricing and shipping info
A Danger Den D4 pump or some people suggest the AquaXtreme 50Z because they say it's quieter, but just like amd vs intel theres people who will say the D4 is better others will say the 50z.
Some Tygon 1/2" tubing.
Already informed you about the water solution.
Build or buy your own reservoir OR you can get a T-line. Just like it sounds the hose splits into a "T" shape and thats basically your reservoir. Danger den sells 'Fill Ports' which can connect to the top of your case for easy filling of the T line. Takes a little bit longer to bleed the system (letting it run and get the bubbles out) but can save on room in your case obviously.
Maze4 GPU Block.
BTW For both block tops I suggest you go brass. Acetal can crack over time from heat expansion and then cooling down when you turn it off.
Danger Den TDX CPU block
MAZE4 GPU Block
Tygon 1/2" Tubing
Danger Den D4 pump (also called swiftech MCP650)
Radiator or Weapons heatercore
That bundle will be about $250, if you go for a regular smaller radiator it'll be about $225 but you'd get much better performance than weapons.
The GPU will decrease MASSIVELY in temps. It's not uncommon to see a 20C+ decrease in temperatures allowing for lovely overclocks.
Let me know if you need more info cause I may of left out something.
I will probably be going that route I listed above myself, but I've decided to get the 6800GT through the step up program instead of WC so that way I can get the MAZE4 that'll fit the 6800GT