for fast boot, the SSD is so very, very worth it -- 15 seconds from power on to ready to use! Load times for WoW regions under 2 seconds.
fans CAN be daisy-chained off a molex as well (and what else will you be using molex for anyway?), and the 309W usage assumes you are using 7 120mm fans in the Challenger U3. (1 front, 1 bottom, 2 side, 2 top, 1 back)
the 3450 and SSD is a better bang-for buck than the 2500K and no SSD