I would recommend getting a larger SSD, at least 120GB. Vertex 4 128GB is about $90. I saw a deal for Sandisk Extreme today for $80. Are you near a microcenter? they have i5-3570k/mobo deals around $230+tax.
Check out my $850 build here: http://www.squidoo.com/electronicandmore#module14708687...
You don't get the SSD but you do get a better motherboard for the price, allowing you to future SLI/CF at 8x/8x. Plus you get a CPU that can overclock in the future, as well as a PSU that can SLI/CF in the future. Plus the 7870 is a better card.
I wouldn't suggest getting a card because at this budget, you should be getting better GPU and CPU over an SSD. An SSD can be added later with SSD caching. IT'll make your HDD MUCCH MUCH faster, similar to a hybrid SSD like the Momentus XT.