Best way to market a top domain name?

Finally got to the stage that we're downsizing the domains we've been working with. Is there someone with experience of achieving good prices with their old domains that can suggest how we go about this?

Seems like there's stacks of places to put them up for sale, but we believe this is a top internet marketing name. We spent quite a bit of time on this before we got sidetracked! We'd like to put the package up on the best site for the IM niche. It's a membership site... at the moment just with a free signup and we'd be selling the name, the site, including all the graphics, one hundred plus products, mostly with resell rights including PLR and the last time we looked at the mailing list (haven't used it for probably twelve months) there were 356 people on it.

We're using the Launch Formula Marketing Script for it, so the new owner would either have his own membership script or be prepared to go grab a copy of this one. We're using ours for something else too and can't include LFM in the package.

At this stage... help please. If you were selling a really good domain name package, how would you go about that?