Unless you need/want the ability to trigger PWs from the meter, the "R" models are overkill with their trigger modules--available separately if you need them. The plain old 558 is a superb meter for the money--usually around $300 used in pretty condition. Got mine a year ago and love it. If you want the gonzo software-based sensor/film calibration function(but not the trigger module), then look for the sometimes-hard-to-find 758D--which Sekonic doesn't officially import into N. America, though it's available thru gray market channels. Just be aware that both models come calibrated for either CE or FCC radio frequency ranges, which means they require matching radio trigger modules(i.e., you can't pop a CE module into an FCC-spec meter or vice versa).