I have both a TDX and the MCW6000. The MCW6000 works a little better in my overclocked AMD64 system with a CPS750 pump than the TDX, but they're both very close. If you have a higher flow pump the TDX may be just as good. I like the 6000 because it's very good even at quite low flow rates and it's cheaper. Because the 6000 is not so flow rate sensitive I don't think it's going to make a noticeable difference whether you plumb with 3/8" or 1/2" ID hose, and the 3/8" is much easier to work with. Just out of curiosity I stuck an extra 7 foot section of 3/8" tubing in my system ( CSP750 pump, MCW6000, BI Pro II radiator), the back pressure went from 31" of water up to only 35", which if my pump is following the pressure/flow rate curves reduces the system from 80GPH to 70GPH. The 3/8" hose just doesn't contribute that much back pressure, going to 1/2" isn't going to buy you much, especially considering that MCW6000 thermal resistance only improves something like 4% if you double the flow rate from 60GPH to 120GPH.
The TDX performance deteriorates at lower flow rates. Get the MCW6000 and you get about the best performance you can get, plus you don't have to worry about using large hose and high power pumps if you don't want to.
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