I never understand the desire for a small system. They are not normally as quiet as a large system and have a lot less performance. They cost just as much as a full-sized system, and sometimes they cost more.
I think you should get more powerful components, if you plan on using this system to play games next year. It is really expensive
to buy a new computer each time a new cool game comes out.
35 + 15 + 45 + 6 + 7 + 9 = 117 watts (+ optical drive)
[You need to know the max
power draw of the optical drive.]The Anandtech article about the 6570 and the 6670
indicates that a DDR3 version would consume about 45 watts, while the DDR5 version would consume about 60 watts. You lose a lot of performance by going to DDR3 memory.
It appears that your new system will not play Civ5 well, but it may work just fine with Civ4.