Find the drives from several manufacturers and divide the price by the # of gigabytes to find the ''sweet spot''. I believe you will find it to be at somewhere around 250 gigabytes as an average but special sales and rebates might do you better. Yes, 20s are out there but rarely advertized, you need to hunt for them. Another thing to consider might be just how much space do you think you will really fill up? If you buy a 250 gig drive for $100 instead of the 160 gig at $80 because the cost per gig is less but you never fill the 250 gig drive beyond 160, your decision just cost you 20 bucks too much.
I`m faced with a HD space problem on 2 computers and maybe soon a laptop I need to kno whats the best size hd for its price and what is the smallest and or cheapest hd avaliable through ide also if they still sell 20gig hd plz tell me.