Worth it for an HTPC? I know it's complete overkill, but the price is hard to beat. Seasonic 300W SS-300ET is $44...
Of course, optimal efficiency is in the 50% of rated wattage range, right? I doubt I'll ever be pulling more than 150W with an i3-3225 + SSD + HDD.
CX430 is $24.99 AR, maybe better suited.