I hated the S4 and the Beats. The P5 has more mids than both. I didn't think the Inspirations were badly veiled, but definitely veiled, like every M50 I've used. Actually, my favorite headphones at the moment are the super-bright Sony SA5000, so I'm not sure why I didn't rip either off my head. QC issues make some pairs better than others? I definitely wouldn't pay more than $150 for either, but I didn't find them bad at all.
I'll have to try them all out in the store, I don't think it'd be fair to judge them without trying them first. Hopefully they'll have a good enough selection on display.