I had a similar question last week. Ended up getting the ASP800 instead of the 8pre-es and DP88, because it was a simple ADAT 8pre and the pres seem to have a little bit of an edge over the other units (marginal). BUT, I feel I have taken a risk, because the ASP8xx models seem to have some failures, so I took the extended warranty from my store. However, from all the demos I have listened to and reviews, I think they all pretty much sound too similar to really have a significant difference in a processed mix. Here is what my thought process was in hopes that it helps you:
I didn't want 2 pres in the front; I wanted them all in the back, so the Clarett was out for me.
I was looking into the 8pre-es because I thought the preamps would be better because the unit is more expensive; I figured it was because it's not just 8 ADAT pres, but also an interface, hence the higher price, so that one was out too.
The DP88 was, according to @
monkeyxx
overpriced for what it was, and I think he has lots of experience with gear, so it was out too.
Then I looked at the Tascam Dyna 8p, but after reading the SOS review of it, I decided it was not what I was looking for either.
Then there was the Midas XL48, which sounded nice, but with a fan people seem to complain about, and not enough reviews for me to make that choice.
These were the units I looked at. I ended up with the ASP800 because of: The sound demos, the many recommendations, no preamps in the front (but DI, which can be handy, but not necessary for me), and it was 150$ off.
Hope that helps you. It took me a long time to make a choice, and I hope I made the right one for me. Make the right choice for you on what you need I/O because in the end, when processed and mixed, I'm pretty sure no one will be able to tell which is which.