The ADA8000 routing goes like this: Analog Input directly to ADAT (digital) Output. ADAT Output directly to Analog Output. So unless the Delta1010 has ADAT Input, it probably won't be your best option. Theoretically you can use an ADAT cable to route the ADAT Out to the ADAT in, but then you're going through through an A/D/A conversion before you even get to the Delta.
I've never actually used the SM box. I think Nady also makes an inexpensive mulit-channel pre. My guess would be these boxes are on the lower end of the spectrum in terms of quality, but again, I've never heard them.
My advice (take it or leave it), is to focus on musicianship, not technology. If you have great players, you don't really need amazing pre's (or even mics), it will come through. On the other hand, you don't want a bunch of noise cluttering up some great playing. And you don't want to be struggling with not being able to get enough gain from a pre.
That said, buying a series of single or dual channel pre's can get expensive, depending on how many inputs you want to end up with.
Ever looked at
the Focusrite OctoPre LE? It seems to sell for $599 from Sweetwater. That would only be $120 more than getting three DMP3s.
http://www.sweetwater.com/store/detail/OctoPreLE/