I'm searching the web for some USB FPGA cards, like Cairnsmore, Ztex, Terasic and so on that i would like to use with my BitMinter account.
None of these cards could be a good investment for me?
Theirs cost is under USD 1,000.
simpic, (valued at the performance) I would not suggest to invest USD 1,000 in FPGA or comparable devices at this point. Although I did too, I can not recommend this anymore. Please take a look at the calculator in my signature, you'll easily find out that just buying BTC would be the best kind of invest compared with ANY mining device you could have on hand the next days.
there are only very few pro's, e.g. you can sell the FPGA in case of bitcoins will become worthless.