new member of the forum here and another newbie too- gotta start somewhere.

i'm looking into buying my first audio interface. i'm using macbook pro (leopard 10.5.6 i think) and logic studio now.
i decided on FireWire and $500-600 price range and so far narrowed it down to ultralite mk3 and apogee duet.
so far i'm really set on the ultralite mk3 for all the extra features and versatility but i've read about the famous fabulous Apogee converters.
in your opinions, are the converters in the apogee a huge difference between ultralite mk3 or just somewhat better? has anyone done direct A/B testing with each?
thanks,
steve