Hi Katie,
whichever module or Moodle version you choose to deliever the quiz questions to students, I highly recommend you make more than 10 questions, as it will be trivial for students to note down the 10 correct answers, and then pass the "test" without necessarily understanding why the answers are correct.
Navigation through the Moodle 1.9 pages requires lots of clicking and waiting for pages to load, whereas Moodle 2.0 has its groovy expandable navigation menu, so that you can quickly expand the part of the menu you want and then just click once to load the page you want.
TaskChain (for Moodle 2.0) might be available in the summer - I plan to make a presentation about it at EuroCALL 2011 at the end of August.
My personal suggestion would be to continue with the HotPot module for Moodle 2.0 for now, and look forward to TaskChain when it comes.
regards
Gordon