I think that before you have a discussion like that you really need to take as good a stab as possible at your own requirements.
I have gone through this exercise a few times before - first, make a list of all the things that you'd like, then categorize them in terms of "Need"
- something you absolutely HAVE to have to make it work, "Want"
- something that is important, but you could conceivably give up if necessary, and "Like", something that is a "nice to have".
Coming up with this can help structure your own thoughts and can aid in your discussions with others.
I wrote more about this process a while ago on my blog at: http://cieldumatin.livejournal.com/4437.html