What is your budget to spend? Are you an enrolled university student (some companies provide academic discounts to verified students, other do not)
What country are you in (some units may be subject to export restrictions)?
Are you planning to do any softcore processors, run some sort of embedded operating system, or just need a basic FPGA with enough memory for fixed point FFT?
Do you need any high quality audio interfaces, or anything else you can specify to help narrow down recommendations?