hmm mmost motherbaoreds now only have 1 IDE, becasue its going out and getting replaced my SATA drives or simpler how ever tehy still have one, you will be able to put a maxmum of 2 on the boared, however I persome your optical drives are also IDE, putting them with the HDDs might cause some problems
next will will need a motherboard means of oyur budget I would go for a 780G(still need the graphics card) chip setit cheap and it does its job and well, you do not need no more and its got futrue expesnion properites..
For Intel you only need something like a P45 or 35 a 35 chipset will be cheaper IF GOING FOR INTEL that is
memory depends on operating system really vista 3GB for that sysytem XP I would only stick 2Gb in it, this would be DDR2 RAM cheap effective what more do ya want
harddrives I would personly go for SATA hardrives they are faster, and more future proof, you might need something like 500Gb stoarge space if not more
the graphics card maybe interesting, but you don't need a nvidia GTX280 or anything near so i would say HD4670 or 9600GT something like that, if that over shoots your budget thanpull the GPU down more. that should help a little