How does IQfeed dde link compare with qlink(old) and esignal's qlink(new)? What is the fastest you have found that is resonable in price. Also does IQfeed have NYSE only quotes for its DDE link?
I'm sure that DTN has a 7-day FREE trial. Why not sign-up for it and see for yourself instead of rely on other people's opinions which may, or may not be applicable to your specific situation. They have pretty good sales support. I currently use the IQ-Feed for some commodity quotes.
I run both esignal and IQ with Quote Tracker. Usually it is esignal that gives me problems however today IQ with QT lagged badly during the PM session.