If I were you, I would come back within a week of buying your build.
In mid-june, the HD7900 series will have gone down in price. Also, SSD prices will have gone down as well (although the OCZ Vertex 3 prices are quite low now because of the new Vertex 4). CPU prices on the current Intel Sandy Bridge processors will have gone down equally (along with Z68 motherboard prices) because the Ivy Bridge processors will have come out (end April).
However, right now, I would second Pezcore27's suggestion