I love the Yammy A4k's

Used to use two of them for live pa, sold one when I bought a lappy but will never let the other one go. They're VERY flexible, cant really go into details cus it will do your head in...

If you want the sound of EMU filters go the E64.

The Akai s3000 is a dinosaur compared to the other two, don't even go there cus it ain't worth it. Not saying they're bad, but they aren't up to the standard of a4/5k or E64k.

Hope that helps...