[One question before the setup:]

Hi I'm new to bitcoin's and am thinking to buy a mining rig..

One question before the setup: Is it worth to get a rig and start mining now ? Or is it to late? 



The setup:

CPU: Intel Core i5-3570K
CPU Cooler: Corsair H80i Hydro Series
MOBO: MSI Z77A-GD65, Socket-1155
GPU: XFX Radeon HD 5670 - I'm going to start with this GPU, then I'm going to buy a better one
PSU: Cooler Master V Series 1000W PSU
RAM: Corsair XMS3 DDR3 1600MHz 4GB CL9

Some questions:

-How much Mhash/s will I earn ? (approximately)

-Is it overkill with the 1000w PSU ?

-Some things I should add/take away ?


Thanks in advance!