You can't get anything decent with 200$ and DDR2 ram.
What you can get is an i3 2100 LGA 1155 processor with ECS H61 and 4GB 1333MHz Kingston DDR3 ram for about 231$ (120$ for the CPU , 65$ for the motherboard and 24$ for the ram(Note the these prices still need VAT and shipping to be calculated.)
That's the best thing you can get.
What I would recommend you to get is:
i7 2600 CPU with Intel DP67BG motherboard with 8GB of ram and 64-bit Windows. This should cost about 588$ (306$ for the CPU 24*2 for the ram and 179$ for the board)
All prices are from
PCandParts