Is The Firebox Worth Switching From The Delta 66? Options

[taylor5784]

Hey, I was just wondering if anyone had any input on whether I should switch from the Delta 66 with omni breakout box to the presonus firebox. Is the A/D conversion substantially better? Are the preamps better? Would I be better off buying a $300 preamp and using it with the omin? I have a G4 Mac OS X 10.3.7 with dual 867 and 768ram and use logic gold. Any help would be appreciated.