Inspiron One 2330 Upgrade

I have an Inspiron One 2330 with the following specs:

• Intel Pentium G2020
• 4GB RAM
• 500GB HDD
• Windows 10

I just recently upgraded it to Windows 10.

I wanted to upgrade the CPU to core series (i3, i5, i7) but I don't know which should I get.

I know that I can get a I5-3550S or I7-3770S, but is there any other choices that I could have?

Also, can I use a DDR3L instead of DDR3 for ram?