What should I spend $1000 on?
This is what I have right now.
A crew of incredibly dope MC's

Shure SM7B
Avedis MA5
Mbox 2 W/PT LE
Massey Plug ins
Homemade PC. 3.4 Ghz, 2 GB Ram, 120 GB HD. Windows XP.
A pretty well treated room with a "booth" made of pvc and moving blankets and DIY Rockwool bass traps.
I'm thinking of the EL8 Distressor or a Digi 002 W/Black Lion Audio mod.
What's more important, Compression or Conversion and a good clock? What will improve my sound more dramatically?
I am tired of the pre's and converters on the Mbox screwing up the sound of my S950 and timing of my MPC60.