I am sure all the superlative comments also apply to the SC-07. You can adjust the output of the Pioneer to enhance all of the sound stage effects you mentioned. Another 60 watts isn't going to dramatically change that situation. Can you use the wide and high channels on the Pioneer? That may change your stage but you can reposition your mains and change the effect also. Play around with speaker positions and settings on the Pioneer before you jump into the separates boat with both feet.
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Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner