you can get boot disks on cd's now, i think...., as computers can boot from cd's, i am sure you can amke flopy boot disks into boot disks on cd's, also, the onyl reason you would need floppy drive is if you did not have somthing like a cd-rw or dvd-rw, or if computers you needed to use boot disk on did not have cd-roms like the crappy computers i use at college lol.
that seasonic would take care if he was running somthing simaler to what everyone has said, but 500w would be safer ibviously, enables oyu to cram loads of stuff in like lights, cathode tubes, lighting fans, card readers, more cd-roms/ dvd-roms, tv tuners, things like the gatewatch for fan speed control etc.......