Upgrade CPU i7 950 to i7 3770K or HDD to SSD?

Hi everybody,

I would like to know which one of these two upgrades more worth it..

I was thinking of buying the new cpu as it will speed up rendering but is the drive important for rendering too??

If I change the drive, will it change rendering speed?

i7 950

geforce 570

kingston hyperX-T 6gb 2000ghz

7200rpm HDD on sata2 (3gb/s)

Thanks,

Yosh