That won't matter. 6.8.X should work fine. The 6.9.x LDM series is a feature upgrade compared to 6.8...with a few bugfixes as well. But I'd still recommend you upgrade... it offers some nice backup features for you so you know when the feed goes down.
i'm aware, however stability in 6.8.x is actually better, and i have had multiple alerts for feed outages for years :) what is revolutionary to one etc..