WIll this selection for memory work??

I'll be building a new rig with these specs:

1)athlon 64 3000($149.00) or 3200 2.2 ghz socket 754($190.00 newegg)
2}512 mb pc3200 crusial ram($89.00 newgg)
3)ASUS "K8N" NVIDIA nForce3 Chipset ($84.00 newegg)
4)sparkle power 530 watt($74.00 newegg)
5)radeon 9700 pro 128mb($150.00 ebay)or 9800 pro(found refurbished one on newegg for around $164.00 , we'll see if they have it when i get ready to buy)
6)dvd drive($23.00 newegg)
7)maxtor 40 gig hd(already own
total=$579.00 or $620.00

I found 512mb pc 3200 ddr400 from kingmax for $65.00. I was thinking about sticking with the athlon 3000, and radeon 9700pro and geting 2x512mb kingmax stick mem=1024mb since it was cheaper. Out of all these parts i see the memory being the first thing that would need more of since i see most people buying 1 gig worth of ram for they're rig. This is for the family to play games and other forms of internet entertainment. But wont be playing doom3,half-life 2, mostly other games. Will this memory work for this Mobo and cpu? I saw some article about memory and mobos on this website but being new as i am to computers thread i did'nt really understand what they were talking about. Oh and i wont be overclocking the cpu at least. Want to sell that on ebay in the future.