Are these parts compatible with each other?

Hi i am wanting to build a gaming pc that will be in a $600 after rebate w/ os and case and all the other parts. I've been learning this for about almost 6 weeks...don't judge. Lol . All of it Is going to be bought on newegg.

Oh if you find the question sloppy. Sorry I'm on my iPod touch.

The questions are at the bottom.

Specs

OD - lite-on DVD Writer- bulk - iHas224-06 lightscribe oem

Case - Antec three hundred illusion black steel

HDD - Western Digital caviar blue WD5000AAKS 500gb

Mobo - Asrock M3a770DE AM3 770 atx

Gpu - HIS H577FK1GD Radeon HD 5770

PSU - corsair Builder Series 600w

Ram - a-data 4gb (2x2gb) 240-pin ddr3 1333 (PC3 10666)

CPU - Athlon II x2 260 Regor 3.2GHz 65w

OS - windows 7 home premium 64 bit oem

Other parts that I will need

Wifi adapter - asus pce-n13 pci express wireless adapter

Anti static wrist strap

Rosewill Pellucid HD Series HDMI cable 6ft

Questions

1) should I change the motherboard? I have selected the asus m4a78LT-M LE because I don't know if I should take an asrock board, but I also noticed a alot of people posted reviews on the asrock board and have said good things and the asus board it isn't that popular. My problem is that I don't want to get a DOA board.

2) Will the build bottleneck?

3) Is the power supply good? I know everybody says that corsair makes good power supplies, but this isn't an 80+ psu. Is it still good to use? Oh, and since we are on the same topic, is that enough power for the case fans, gpu, etc.? 

4) is this build good for atleast 1 year? Im going to do a powerful build in June of 2012 and wanted this to stay alive till then so I can give this build to my sister.

5) will the parts work together?