You could try other alternatives like V.I.P cabinets. Really good built in quality
http://www.kunhar.com/vipcabinets/
I my self have G 300 Cabinet from VIP... and its just amazing. the build quality is awesome can be compared with Antec

and Plus its screw less...a Plenty of room for air flow..
G300 cost me 3500Rs here in Mumbai. which included 300Watt Rated PSU
Dont underestimate coz of being 300watt....its rated..but actually u can give stress about greater than 400watt + ( I myself run X1900GT on it....where the minimum requirement of X1900 GT is 400 watt with 25 Amps on 12 V)
U may refer thid pdf
http://www.kunhar.com/vipcabinets/do...sion-chart.pdf
The second one over there is one which comes bundled with G300
And I wuold like you not to have 400 watt Zebronics.cuz it totally sucks..My friend uses it....and has very bad experience of it...Dont know about 500Watt Zebronics