I had planned on replacing parts as I go, and not building a fresh new rig. Performance in most games is adequate, but frame rates are low in Rift (teens and low 20's) and playing Civ 5 the rig starts laboring hard. I can tell it's getting close to wanting some upgrades, but not sure where to start.
Where would you think a bottleneck might be - is the gear just old, or do I have a weak link? Should I splurge on a shiny new graphics card, or will I merely be shifting the bottleneck around? Also note - I have not overclocked at all - planning on trying that this week. But I don't think the processor is really an issue, I think it may be the 4870...
I'd have to know what case you're using but that could be due for an upgrade. There's quite a few really good ones that you can get for not that much money. I'd recommend the Antec 300 or the Cooler Master 912. Both can be had for less than $60.
Although I'm not sure any PC can run Civ V on the large or huge maps... unless you'd rather spend as much on a PC as you would a Hyundai Accent.