Which CPU cooler is better?

Hi, I have decided to move to an AIO CPU Liquid Cooler. Which of the following is better, and why? Cheers :)

http://www.msy.com.au/saonline/cooling/15204-deepcool-dp-maelstrom120-maelstrom-120-aio-enclosed-universal-cpu-liquid-cooling-system.html
http://www.msy.com.au/saonline/pc-accessories/12164-corsair-cwch60-se-h60-se-universal-hydro-high-performance-liquid-cpu-cooler.html
http://www.msy.com.au/saonline/pc-accessories/15019-coolermaster-seidon-120v-plus-rls-12p-20pb-universal-cpu-water-cooler-with-blue-jetflo-fan.html
 
Solution
I understand. I also understand how expensive parts are in Australia and NZ. The Corsair is probably the best choice for what you want and for your case. With no overclocking and no current thermal issues, it will work fine.
I don't think I'd choose any of those for their cooling performance. Any half decent air cooler will probably outperform them and do it more quietly. If the move to an AIO is for aesthetic reasons, then the strongest of those is probably the Corsair H60SE, by about five degrees on an average load. I wouldn't recommend overclocking on it at all.
 
That's the exact same case I had for the last two years. I just replaced it with the Fractal design Define S. I did some decent modifications to that case and it cooled like a champ. You can check those out here if you feel like doing so:

http://www.tomshardware.com/forum/id-2528266/140mm-rear-exhaust-storm-enforcer.html

It only supports small 120mm radiators though without serious modification so you're on track with what you've outlined above. I suppose if I had to go with one of those it would probably be the Corsair unit, much as I hate to admit it. The CM Seidon isn't bad either, for a small unit, but the one you have outlined is the older revision 1 unit and I'd probably avoid it. The Corsair unit is a 2nd gen H60 and is better than the gen 1 Seidon. If it was a newer CM unit it might be more of a competition.

I believe the Corsair unit is quieter than either of the others as well.


 
A silent workstation or home machine is more important than low cooling temp. I don't mind a bit of trade off, say +~5C over +10dB. From that perspective, I found these models delivering excellent results on many machines:

Cooler Master Nepton 240M Liquid cooler
Cooler Master Nepton 120XL Liquid cooler