i am looking for the the best card indexing system for under $50

dude if you know what a card indexing system is, then sit down for 5 minutes and think of your own and make it. save yourself some money.

I only know of the ones in 13 steps to mentalism are they good enough

I'm pretty much quoting misderection: just sit down and make one up, using the one in 13 Steps as a base for whatever you need it for. A card index should be personal, because you're the one that's going to be needing it; and therefore you're in the best position to determine exactly what you need, how you need it, and where it should go.

Tony Miller has a good one that is adaptable to most situations http://www.rfaproductions.com/products/AIindex.html

Check out Kenton Knepper's Kollasal Killer. Reach into you wallet and pull out any card (well almost). Very clever.

Can somebody pm me with plans for the q5 system in 13 steps i can not understand what to do to make it

Check out the Anywhere Index and Soft Touch index;
http://www.rfaproductions.com/products/effects.htm