I just got a new NXG RM802 remote, which is a rebadged MX-850, to supplement my MX-700. You can download the software to program the RM802 from the NXG web site. My existing MXF file from my MX-700 was loaded into the new NXGG RM802 remote with no problem.

The RM802 is both IR and RF, just like the MX-800. It should work with your MRF-200 blaster (I doubt that non URC /NXG remotes will work though).

I got the remote from Amazon for <$165.