My GF loves these types of games, but doesnt seem fussed which version she plays.

I wouldnt play it myself, I`ll just stand behind watching her..

Im worried that with the physical nature of the game second hand games would have problems.  Are these games ok to own? Nothing inherent to watch out for?  I know things break but if I get a good unit should I expect a hefty maintenance budget?

A NEW DDRX goes for around 11,500 to 12K CAD?  What does the second hands go for?

Also with her not being too fussed which unit she plays, what similar games are there to DDR that might cost less?  I know theres other DDR type games but which is considered the best?

I think the games room is going to have 4-5 pins - a larger arcade like DDR, a mame upright and a air hockey.