A300 or 5175 or XPA3

[fishguts]

I currently have a Fusion 8100 AVR and getting anxious to upgrade.  I currently run Gallo Classico 2, Center, and surrounds with the Classico 12" sub.  Would the A300 be a noticeable difference in sound quality over the Fusion?  For now the Fusion will be used as a Pre for the L and R, and surround duties.  Would the XPA3 be a much better choice or not noticeable with my set-up.  Mostly movies/TV, with 20% music.  I will ultimately upgrade to either the xmc2 or Marantz Pre/Pro.  
Thanks

[pedrocols]

I much doubt you will hear a difference with any or between those amps.

[fishguts]

Do you feel they would be the same as the Fusion and no need to upgrade at all? or the A-300 would be an improvement over the Fusion, but beyond that, not needed?
What would be your first recommendation on system upgrades to improve the sound?

Thanks,
Brian