What "spec" don't you like about the PreSonus DigiMAX FS? Maybe the price?
The I/O. I use a Digimax 96 in my Pro Tools rig. The ADA8000 I/O options make it more useful to record live. I don't mind paying for a high quality unit if it does what I need it to. I'm too old to make a cheap price one of the top priorities in a purchase. I have wasted enough money doing this band thing. It really is cheaper in the long run to buy high quality gear the first time.