dunkel, sorry, just catching up........30 mediums in a ranger? a great deal of work for you.
reading what pete said? very true; extraction is a hot,sticky, tiring task even for a few hives, especially when you are limited with a smaller extractor.
when folks ask advise about extractors or say what their budget is.........i always say buy for the future, you won't regret it..........
prices are steep on equipment.......but if you ask me, it pays for itself in more ways than one. i have two, a nine and 20 frame.
the maxant 20 frame is nice. also, i have been hearing good things about the lyson extractors (and a little less expensive).
good luck, let us know what you decided to do!