Lets put it this way, you will get BETTER sound with the Urei then another, modern mixer! However, you wont get the best you can from the Urei! The digital EQ/Crossover will have a definite influence on your sound. You can get it to work pretty good, but the best results are obtained by having the best sounding components in the ENTIRE signal chain.
But, I think you could get somewhat satisfactory results with proper setup and careful adjustment.
If your really serious about only buying gear ONCE then I would save up, and buy the best from the get go. Whether its digital or analog, the top shelf is always the best!
Mr. Scott Fitlin