rolo, welcome to the forum.
Its a hard thing to decide in the showroom, if you can get them to audition in your home you are much better off.
I own the 83's so can only comment on them. To me they are a phenominal speaker for both music and HT, I do alot of both...60% music/40% HT. The 83's are easily driven by a mid level amp where as I have read that the RF7 likes to have more power behind it. However, I just added a 200wpc x5 amp a week ago and the improvement in fidelity and overall sound especially the mids and bass control is staggering.
Dedicated HT, 20'x15'.5", Sanyo PLV-Z5 PJ / 96" diag. Da-Lite CinemaVision screen, Oppo 971H DVD Player, Emotiva MPS-1 5x200wpc Amplifier, Yamaha RX-V2500 pre/pro, Klipsch RF83 Floorstanders (fire breathing monsters) LOL. RC64 Center.,Mirage OM260 floorstander surrounds,Polk R10 rear surrounds, Paradigm PW2200 Sub (teeth rattler)