Recommend computer upgrade for smooth FTB gameplay

[SKR]

Hello. I am hoping I can get some advice on my plans to upgrade my computer.

CPU: intel core 2 duo E6600 (2.4 GHz)
memory: 6 GB DDR2 (PC6400)
graphics: GeForce 8800 GTS (320 MB)

(It's not all old. I have recently bought an SSD hard drive. I have also upgraded from win xp to win 7)

FTB runs acceptably in a brand new world, but fps drops rapidly when machines and tubes start appearing. I would like to upgrade my computer to handle the game well.

I also want the computer to be cool, quiet and not too power hungry.

I am not playing more advanced games.

Processor alternatives

• intel core i3 3240 (ivy bridge, 55 W)
• intel core i5 4570S (haswell, 65 W)

The i5 model "S" is a bit slower compared to it's siblings but it is 20 W cooler. Also, I don't plan on overclocking. I will probably replace the stock cooler, and that cost is the same regardless of the CPU I pick so I'm leaning towards the i5.

Graphics card alternatives

I have read Best Graphics Cards For The Money: June 2013 to get a basic idea. But Minecraft isn't taxing the GPU much, is it?

• Use the intel built in graphics. (Good enough?)
• Radeon 7750 (Low power card, 55 W)
• Radeon 7770 (80 W)
• Something more expensive?

Memory

• 2 x 4 GB DDR3 1600 MHz

Not much to say, is there? If I need more I can upgrade later. CAS latency 9 vs 11 perhaps, but the price difference is pretty small.

Motherboard

There are so many... I guess I'll just look at the CPU socket and then pick one at random.