Aspire E1-771G possible Upgrade Options (CPU/RAM/HDD)

Hello dear guru.

My model is: E1-771G-33114G75Mnii

I already update:

1. memory - i install 8GB in second slot. total now be 12GB (4gb native + 8gb)

2. hdd - i replace default hhd to SSD Crucial MX300 750GB.

After this updaates laptop work fine.

Now i wish upgrade CPU.

i look what chipset laptop have:

CPU native - Core i3-3110M

Chipset name - Mobile Intel® HM77 Express Chipset

Soket - 988B rPGA

Model -  EA70_HC

i go to intel and see specification - http://ark.intel.com/products/64339

On it i see i can use many CPU for upgrade. i wish some i7 model with 4 cores like i7-3612QM / i7-3610QM /i7-3720QM / or some other.

Please can you help me to i be sure about i am right on my thinking.

I wish to be sure until buy CPU necause i need waiting lot of time until i get it and also cpu cost money so i not wish frozen my money

Please help me.

Thank you.