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[http://64drive.retroactive.be/ 64Drive] ($199 including a CIC chip) Supports ROMs up to 256MB (2Gb) in size, includes RTC, possible future 64DD support with no need for ROM conversions. Much better option for developers than the EverDrive due to USB and WiFi support, along with a debugging button on the back, but is also a great choice for casual users along with the cheaper EverDrives. Also supports the separate UltraSave, which can dump/write saves from real carts to the 64Drive. 100% compatibility with all released games.

[http://krikzz.com/store/home/30-everdrive-64-v25.html EverDrive 64 v2.5] ($106 including a CIC chip) Supports ROMs up to 64MB (512Mb) in size, although the SRAM is stored at the end of the ROM, which corrupts 64MB games that use the entire ROM and also saves (Pokemon Stadium 2 is the only known example), no RTC, 99.9% comptibility (no Animal Forest due to lack of RTC, and Pokemon Stadium 2 due to the previously mentioned SRAM/ROM sharing). Must reset before powering off to save. Also includes support for 64DD cart conversions.