Also.. do your calculations as to electricity costs etc.
Many already say that it's highly dubious as to whether a card will pay for itself in any reasonable timeframe.
Spending the same amount of money on a bitcoin exchange directly for coins can indeed make more sense.
Not to put you off mining totally though.. personally I think it's nice to have at least a basic mining capability - so long as you're aware of the costs and that it's just a different way of speculating.
+1 to this. Unless you have a small server farm or datacenter, the costs of mining coins by hand now are not worth the amount of electricity you're paying for the privilege.