i had a 200a4 and my uncle has a new excelon thats 70x4. hands down winner was the old school rf. sounded better , played louder , ran a little hotter but it killed that new school excelon. go with the rf.
I'm currently using the exile and it is a very clean sounding amp but I doubt it does rated unless its super efficient because of the 50amps fuse rating.
I also read that the old school RFs are way underrated.