congratulations on taking the plunge into your ist build. i myself did the same 2 months back so im no expert, but hopefully i can share what i know until sammorris and killerbug see this (they are 2 members who really know there builds and love to help). 1st for the biggest questions:
motherboard- many people here say that brands like asus have lost some quality over the years and recommend gigabyte. i bought a gigabyte for my 1st build and would absolutely recommend them to anyone.
RAM- corsair is a solid brand and 4 gigs seems to be standard these days.looks like the i3 uses 1066/1333 so these would be decent link
power supply- again, i have limited build experience but i know corsair is very solid here too.for that build you can get away with a 450w supply but many recommend going a bit bigger if you can afford it to future-proof your psu (also go modular if you can afford it).
video card- the i3 has onboard video but if you dont plan on gaming, any 40-50 dollar card with hdmi should suit you fine.