HU since your budget is limited try out Pioneer , you can try out the recently launched JBL HU's too. Front speakers Pioneer's were good in my Verna! Rear co-axials try out JBL! Stay away from Sony when it comes to ICE , they are prone to conk off soon!
I think you may have to slightly increase your budget. For prices wait for Ilango's and Raj's replies!
I would recomend the JBL head unit. Go for front components and rear ovals on the parcel tray. If budget is a constraint then do it in stages. Altertenatively you can go for the stock system and speakers which come with the Sportz & Asta. It costs 12K. If you know someone who's buying these models and upgrading to a better system you can buy it off them. I am buying a Sportz and doing it but unfortunately I'm in Goa so I have to sell it back to the dealer for 8K. You will definitely find someone in Delhi, willing to sell.