how about the nr200p cooler master or even fractal terra.
those may probably be available in india
Galax REV 03 is as good as it gets around 20 liters. It is around 22 liters which is not exactly SFF (I think the universally accepted cut off is 20 liters) but just 2 liters above is not even noticable unless someone pulls out a ruler.
I see Asus AP201 suggestion quite a lot here. People fail to realise that AP201 is
33 liters. That is a massive jump over Rev 03. 33 liters is nowhere close to SFF.
Coming back to REV03, this case supports a full size
ATX PSU and mATX motherboard.
SFX Power supplies and Mini ITX motherboards are prohibitively expensive for a lot of us here so building in this case saves a lot of money.
Related to the cramped internals on Rev-03, SFF cases dont have a ton of space inside. Building in any SFF case will require much more work (and time) to get everything just correct.