Try using hn-filter, a feed that I made last week.

For example, http://hn-filter.heroku.com/rss?cmt_gte=2&point_gte=5... gives you 10 HN articles with more than 1 comment and 4 points in RSS format.

It also gives you the number of comments and points.

The source is at http://github.com/kijun/hn-filter

Hope it helps.