New
#1
Assuming you've checked with your laptops system specs as to the compatibility of your choices. I would go with the 8 gig of ram and if your mobo supports sata III, I would go with the sata III hard drive (read/write is faster).
Note Sata II = 3.0 and Sata III = 6.0
Memory I would get PNY it runs like a Thorughbread
But you can always go to Crucial ,com and find out what would be best with a system scan
now Hard drives ? if you want speed get a SSD and throw the other hard drive in a enclosure for back up then that laptop will be ready for Take off Literaly
Having a look here...it says in the overview, it supports usb 3.0 which is a very good indicator that it supports Sata III. Although, your Sony is like my Samsung laptop in that they are very vague in there specifications listings.
Sony 15.5" Core i5 Laptop | VAIO S Series Laptop | VPCSE23FX/S | Sony USA
If the SATA III is with a Marvell driver the odds are you will have nothing but problems. Intel has got rid of Marvell and I can guarantee it doesn't work with my Asus motherboard.
You have a Intel chip so most likely you have a Intel mother board. The older boards used Marvell and the newer motherboards use a Intel SATA III.
Use this little free program to see what is in your computer.
Speccy - System Information - Free Download
You can also use that information to update your system specs.