There aren't any lower limits. You need to attain at least one seat. So that amounts to:

16 million people, say 10 million can vote; 70% of that will vote; divide by 150 for one seat = somewhat over 40.000 votes to get in parliament.

Bos and Balkenende have clashed heads too often to go all smiles again and negotiate without becoming the joke of the century. The worst option would the Denmark scenario: a minority government between CDA and VVD - in other words, a continuation of what we've had the past aching four years.