Exemplary research papers?

I teach a hands-on lab course on how to do research. Students perform a small research project and write a paper about it, preparing them for the research work of their final thesis.

I want to revise the set of example research papers I’m using. We study these research papers as good examples of how to perform and present research. (Think: “Best XYZ ever!”) So I thought I’d ask you: What research papers would you consider exemplary for these particular aspects of a paper:

1. Paper Title
2. Abstract
3. Introduction
4. Research Question
5. Research Hypothesis
6. Exploratory Research Methods
   • Ethnography
   • Exploratory Case Studies
   • Interview Analyses
7. Confirmatory Research Methods
   • Surveys
   • Confirmatory Case Studies
   • Post-facto Data Analyses
8. Related Work
9. Conclusions

Papers are ideally short, well written, and fun to read, next to being exemplary. Thanks for any feedback!