Here is my system specs:

Asus P5Vd2-vm se motherboard (onboard video)
E2140 cpu (rated at 65w)
40gb 2.5" laptop drive.
pharos gps receiver
serial touchscreen vga monitor (10.4" Mobilevu) has its own power supply built in.

going to add in the future:
bluetooth dongle for phone
usb fm tuner
satellite radio
maybe usb volume knob of some sorts

i have been looking at several power supplies and the picopsu/m1/m2-atx seem underpowered for my system however i dont even know if they will run that motherboard. currently i am running off a power inverter and want to run dc-dc. i figure i am under 100w but not 100% sure. any suggestions?