I went staggered on my Irish Tours - partly because they were going on a 62 re-issue with an appropriate "60's" radius (can't remember what it is exactly, sorry!), and partly because I've always had staggered on strat pickups in the past.
I would take into account what Ratrod says though. With the Irish Tours (in fact BKPs in general) I seem to prefer having the pickups a lot closer to the strings than I always used to with others. Because of this, and because my style has changed a bit after I broke my right arm last year, I sometimes find my pick getting caught up on the pole pieces on the middle pickup now. It's usually only if I've been playing another guitar for a while and then pick the strat up. I soon get used to it and it stops happening, but it can get annoying! Even with ITs, I suspect I could have used non-staggered and wouldn't have noticed a lot of difference in string balance.
