put in a way better GPU.
replaced it with a slightly better cpu cooler
Got a cheaper motherboard (he probably didn't need the extra features on the other one...)
made the ram cheaper
got rid of the sound card (although i think it's a good investment if you like listening to music)
downgraded the PSU (but got a better brand IMO)
Added in a SSD and a HDD (so he can actually install his OS and programs lol)
Oh ya. I really think you should post another thread in roughly 2 weeks since the new Nvidia 7 series GPUs are coming out and also the new intel hanswell CPUs are coming out on june 1st too.