I was just about to finalize my system when I noticed DDR went up yet again!
DDR PC2100 512 MB from crucial.com = $190.79
DDR PC2100 256 MB from crucial.com = $96.29 (or $192.58 for 2)
RDRAM PC800 256 MB 16 device Samsung from googlegear.com = $78 (So, $156 for 512 MB since you add in pairs)
RDRAM PC800 128 MB 8 device Samsung from googlegear.com = $38 (So, $76 for 256 MB since you add in pairs)
Looks like I am going i850 and I think I will vomit if I hear another person say DDR is cheaper than RDRAM.