The real Pro-audio level probably doesn't look at mixers that cost less than $5K. Not worth their while. So all the mixers you're mentioning are really geared for lower end who need more channels. The effects aren't critical and if you wander around them enough, you can find useable settings. (I'm a very light effects user. If you can hear the effect, it's up too high.) And yes, there will always be something new coming or better coming or something. Can't worry about it. I'm wanting the DL1608 to last me until I quit doing this. (Somewhere about 8 years from now.) I don't expect a lot more features added to the software. Could be pleasantly surprised, but the current version of Master Fader has exceeded my expectations. Will probably take the multiple ipad control route so I can see and use all mixer channels at the same time.
By the way, I like the iphone app "Remote" for controlling itunes. Will probably be using it for my Senior's show this spring.