If I were able to choose 2 PSU's I would put the Antec in my most powerful and overclocked system, although the price is a bit higher the advantage of having 550W of juice with controllable volt lines is really worth it.

The second one for a more modest system would be more difficult to pick, although the idea of having a passive PSU is quite attractive due to the absence of noise, the higher price combined with possible increase in case temperature might set me off though. In a badly ventilated case it would be best to put in an active PSU, the 120m powered units would do great here. The Global Win and Aerocool PSU's provide a good mix of the above two choices.