The motherboard you got looks good. Plenty of expansion slots. Just make sure your PSU can handle plenty of surplus power as they slowly degrade how much they can put out as they age and you will most likely be adding expansion cards like a sound card, USB 3 card, and maybe a TV tuner down the road as well as more HDD's and such.
He just means make sure your power supply isn't the bare minimum as your system will only grow in power requirements with addition peripherals.
But yeah, nice mobo, good processor, although why not try for a 4770 or 4850? not that much more expensive.
And wait for a while till after the holidays for prices to go down on the graphics card if you do get a better one.