[snvzz]

I'd go with any cheap[0] xilinx one that supports microblaze soft CPUs.

If all you need is a RISC-V softcore, then there's plenty of options outside of Xilinx ecosystem. I like anything yosys/nextpnr supports well.

0. https://www.joelw.id.au/FPGA/CheapFPGADevelopmentBoards