Who can tune this thing right?!

[Wiseman]

I strongly recommend you read and understand basic differences between cm570 , cm870 , cm871 and their ECM management . Here is more than enough information to get you thinking on your own . And of course you'll find out that out there's very few people that can make it run right . And I mean it ! Very few .
Than you're not going to have any trouble to make your own choice which way to go .