Thanks for the replies Malcolm and Gary. I feel that getting an Argo Navis will help me maximise my observing time. While I am reasonably proficient at finding stuff using a chart and finder, I also waste a fair bit of time when I can't track down objects. With three or four, sometimes more, sometimes fewer, observing sessions each month I'd like to make better use of my observing time.
Gary, I'll drop you an email.