ehh sorry, but while I have a bunch, I only ever buy them for some special reason. Each has a meaning and importance, as stupid as that sounds. (for example, a player's first or last club jersey, a final, something like that.)
Quick list off the top of my head though...
France
1998 World Cup-home, and another with Zidane #10 on it
2006 World Cup-home, away with Zidane #10, and goalkeeper with Barthez #16.
2008 Euros-home
2008/09-home, and another home with gourcuff #8
2010 World Cup-home
2011/12-Home with Gourcuff #8, and a blank away (first nike kits)
Arsenal
70-71-retro jersey! Probably my favorite.
08-09-blank home and away, and nasri home
10-11-blank home, nasri home, vermaelan away
11-12-wilshere home, henry home (just ordered)
And beyond that I've got at least 2 PSG jerseys, 2 Barcelona jerseys, 1 celtic jersey, and 1 Lyon (toulalan) jersey.
So that brings me to a total of....27? I think. Overall favorite is probably my retro jersey though. I bought it the last time I was at the emirates, day before I flew home, and I was absolutely gutted that I had to leave London...like I said, sounds stupid but it's my own personal little connection to a good memory.