Replace my Cabridge 500se w/Arcam 72?

Howdy,

I'm wondering if I'll notice a significant improvement if I switched to the Arcam 72 from my Cambridge Audio 500se. My musical tastes are more singer/songwriters with splashes of clasic alternative.

The rest O'my rig:
Paradigm Studio 60s v2
Anthem TLP1
Odyssey Stratos w/cap upgrade
Mid-Fi cabling throughout (MIT, Groneberg, Signal, AQ)

I need to stay in the sub-$400 range used. I want detail without harshness, a deeper sound stage and better midrange clarity. Will the Arcam give me that over the Cambridge? If not, then what will given my budget?

Hanx!