Nexus 4 8gb is 299$+14$ Google shipping plus taxes(no tax for hopshopgo address) .. Hopshopgo rates(for first 500g) are 21$ for standard shipping (6-8 days).. 25$ for express shipping (3-6 days).. 10%fuel surcharge, 1% mandatory insurance.
Customs is common for all and doesn't vary from different companies, it is calculated in india when package arrives here, it is cleared by fedex/dhl and has a flat 350/400 clearance fee...
Delhi customs is known to overcharge . Bangalore customs has been fair.. .. Also hopshopgo requires a mandatory paypal account for payment .
Let me know if u need me to get anything for you ,I am getting stuff from USA, can get for you too.