choosing psu

wc6h02

(CPU)Intel Core i7-3770 Ivy Bridge
(MB)ASRock H77 Pro4-M
(RAM)ADATA 2GB DDR3 1333 *2 & ADATA 4GB DDR3 1333 DRAM *2  
(GPU)ASUS GTX 560 DIRECT CU
(PSU)ANTEC HCG620/520 High Current Gamer 620W/520W 80Plus Bronze
(Case)COOLER MASTER ELITE 334
(HDD)Seagate ST3500418AS ATA Device 500GB
(DVD)PHILIPS SPD2519T ATA DEVICE
(SSD)Plextor 128GB PX-128M5P M5 Pro

dunno whether the psu are able fit in my case
I find that my case support a standard PS2 psu ,which has 150mm x 86mm x 140mm dimension
but the antec one is a tad longer than that   (150mm x 86mm x 160mm)
So, could it fit in my case?


Also, which one is more appropriate for my PC, 520W or 620W?

wc6h02

thx pal
just to make sure I won't get the wrong one