Looking for an external HDD

I am from Delhi and I am looking to buy an external hard disk. I went to Nehru Place today and checked out the prices. Here are the cheapest prices I could get.

Maxtor

160 GB - 2560 INR
250 GB - 3140 INR
320 GB - 3590 INR

Seagate FreeAgent | Go

250 GB - 3450 INR
320 GB - 3890 INR

My question is which one I should go for. Maxtor or Seagate? I could not find any WD hard drives in Nehru Place. Maxtor has got 3 year warranty and Seagate has got 5 year warranty.

Also should I go for 250 GB or 320 GB variant? 320 GB has got better price per GB, but is there anything I should be aware of regarding 320 GB drives.

I also saw a Maxtor One Touch 250 GB hard drive for around Rs. 3500/-

Please suggest.