Having had a star analyser for a couple of years, I can highly recommend them. With a bit of very simple work they can placed in front of an unmodded 350D and you can obtain usable spectra with quite short exposure times, less than 5 secs.
I can get spectra from a fixed tripod / 350D / 135mm lens combo as quickly as 2 secs exposure, depending on the star magnitude.
http://www.patonhawksley.co.uk/staranalyser.html
regards
Mark