I am in a need to buy a new Smartphone and as per it's my requirement i am confused to opt between the Dual Core one or the Quad Core one. Though Quad Core cost couple of thousands bucks more but it does not resides the power of Intel in it, which actually Xolo mobiles do. I know that xolo operates in India under lava but they tied up with Intel and are producing seriously amazing devices.

If anyone out here can suggest me then it will be very helpful.

What do you want, more power or just to stick to Intel..
I think A500 from XOLO is good as its cheaper and I don't think Lava IRIS 458Q with quad-core will be any help when it has only 512 MB ram. Go for mobile which has atleast 1GB ram as newer application need more RAM and I think this requirement will increase only.