If your show consits of card magic, you closer to keep the pattern has to be with cards but out of the box card magic, so something like The Pandora system by Shane Black. If your show consists of mentalism finish with mentalism but something stronger than anything else you did.
You don't want to do a a good card routine then change into mentalism, because well the spectator may wish that you never did card magic or the other way round there are other reasons too.
Pick up a copy of Magic and Showmanship by Nelms, it has a couple of good stage effects and the information in there is invaluable, I have read it like 7 times and i learn something new every time.
I am directing my own show in 8 months, my closer currently is Control my WH and then do the second half of For Andruzzi by luke Jermay avalible in 7 deceptions (stops spectator's heart) but thats just for me because my "theme" would be: Being control of body and mind (its titled Body and mind
) so I would be doing mentlism and geek effects that run on the same line as control and For Andruzzi.
You always want the closer to be the most amazing thing, because it would be the most effect they would remember if you played your cards right (no pun intended), so you dont want to do control in the middle of a routine then finish with a watch stop....