My host provides free domain privacy which prevents anyone from seeing my personal information in the Whois data. Are SEs going to be more suspect of sites that don't include their personal contact information in the Whois data?
I don't know uf it will have any effect on SE Ranking but there are sites that rank your sites trust worthyness which will drop I am sure if you hide your info
I've not heard anywhere that this would hurt your placement in the serps with any major search engine.