Building computers is fun and pretty easy..... and a very good learning experience. I have been building them for 10+ years, and have always used Asus boards, only had 1 of them puke on me of the 40-50 computers I built...
I would highly suggest them....
Lian Li makes great cases... No question about it...
Look into good quality cooling fans, quiet but reliable.
Don't skimp on the RAM, get Matched sets Name brand stuff, not generic. Crucial, Corsair, Ocz, they generally have a lifetime warranty.
Buy 2 X the amount of HD space you want and set it up as a mirror RAID, so you don't lose the data if you can... Most motherboards provide this onboard.
Its nice - times have changed and there are so many options out there to work with and you can build a sweet setup for relatively cheap...