$200 budget for CPU/Mobo/RAM/Case & maybe PSU

[crashtech]

http://pcpartpicker.com/p/RMWrbv

It'll be a bit faster than what you have now, shiny and new. Drop in an i5 later when you have cash and people are unloading their Haswell kit for cheap.

I think the OP already made his choice back in post 11, which will probably limit upgrade choices in the future.

 

[stockwiz]

buy a black friday laptop in November. You might be able to get one for $250.

 

[Donanza]

You are going to get very low-end parts with this budget.