Ah, yeah I hope they work out for you. Just switched between the Shures and S400s (unfair comparison I know), you're right. It does sound like the instruments are all on top of each other.
I'll have TrollDragon's and Achmedisdead's inputs as well on the S500s though :3
I'm really eyeing up a set of Shures, probably the 940s or those new 1440s. To be honest, I've to many options at hand and when I come close to buying I always drop off and end up stuck with what I have I just need something better, I'm sorry for my own wallet.