Ah, I was worried for a minute.
Your two best upgrade paths would be a new CPU+MOBO
The first will give you more performance and longevity, but the latter will decrease boot and load times.
If you need more performance go CPU+MOBO, if you dont SSD (Such as the 840 EVO).
The only problem is adding a new CPU/MOBO would come out closer to 300 than 200. So its above budget any way you roll it. The SSD is well in said budget. PCPartPicker part list
/ Price breakdown by merchantCPU: AMD FX-8320 3.5GHz 8-Core Processor
($149.98 @ OutletPC) Motherboard: Asus M5A99X EVO R2.0 ATX AM3+ Motherboard
($99.99 @ NCIX US) Total:
$249.97Prices include shipping, taxes, and discounts when available