You say that you have some items that you plan to reuse. Please share the details on those items. They may be find but they may end up causing bottlenecks and problems so it's much easier to make suggestions with those details. As for price, in USD, one can build a top end system for less than $1300 and that includes an SSD.
first thing u should give details as what resolution is ur monitor what cabinet do u have company size fans
assuming that u have a mid tower like haf 922 and u didnt mention oc or not
this what i sugget
intel i5 2500k if oc or 2400
cm hyper 212 if oc
2x 6870 or 2x6950 or 7950/70(buy 6950 and unlock it to 6970
mobo the cheapest asus z68 or p67 that supports trifire if oc or h67 mobo