If you have an Evga 430 and you only want to spend $100 or less you are not goig to get much of an increase. Take a look at this link ;
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130625
and see if that is something you can swing , it would be a good increase from what you have and it does have a rebate.
The other thing you might try is if you registered your card on the Evga web site and it is less than 90 days ago they do have a step up program you could try.