Originally Posted by Zap
Buying a more powerful PSU than you need will cost you more money up front at time of purchase, cost you a tiny bit more money all the time (may have lower efficiency at lower loads) and give you that huge wad of cables when not using a modular unit.
Buying the wattage you need will likely result in you using the majority of the cables, and thus not needing modular.
Yes, unfortunately the excellent and cheap Capstone PSUs are deeper than the others you mentioned. Seasonic has better quality output and is more efficient than the Corsair, but costs more money. It is also quieter.
What components will you end up using? Maybe you don't even need that high wattage? Seasonic makes a 360W G series.
For sure I don't need the wattage, I could get away with the 360W, but that one actually isn't modular. Same for the XFX model suggested by lehtv, Antec Earthwatts 380W, any number of other things. The review of the Temjin case was quite insistent that it demands a modular unit though.
I guess I ought to look into exactly what cables are included with a small unit like the Seasonic 360W, that may be the way to go if there aren't too many extra cables. If Seasonic is quieter than Corsair that seems a reasonable excuse to spring for it.