I am in love with my ARC ls-7. I have upgraded rocket logo tubes from Upscale and run a Sonic Frontiers sfs 80 and power Mirage m5si speakers. The m5s have 2 6.5 inch drivers and the bass and midbass response is fantastic. Low deep and accurate. Midbass is musical and kick drums are tight and realistic. With the right tubes, any of the ARCs you mentioned will be great. The LS-7 is about 700 used... a bargain to say the least!!
Happy listening,
Joe
Custom Audio LLC
Happy listening,
Joe
Custom Audio LLC