RAM 1GB DDR ram - that is ur choice ...keep it as last option depending on how much money u have left aftre getting remaining stuff (aprox 4K) i may be wrong check out...
Y ur going for 256 mb card , wasting the extra 1.5 to 2K, instead for 126MB 6600GT, u can play all latest games, agp is arnd 8k to 8.5K,......
go for 80Gb hdd if ur mobo supports 160 GB hdd else stay with 40GB.....company ur choice
5.1 speaker - can go for creative......does ur mobo has 5.1 suppport else u haev to buy sound card
dunno much abt DUAL LAYER DVD writer .... but benq writer r good then liteon then sony....i bought benq DW1650 for 2.7K