Impressed with the B irons this season.
In April, a guy I know let me hit his J36 irons with Nippon NS Pro 1050 (I believe) stiff shafts. I hit four of six shots dead solid with his 6 iron. I was a bit surprised, as I had dumped stiff shafts in all my clubs and gone back to regular in 2009. (Since then, a couple of our fellow Sand Trappers have suggested that the NS Pro shafts have flexes a tad softer than most other brands).
A Bridgestone ballfitting team showed up at my club in mid-July. Besides balls they brought some irons with them.
I hit a 4i, 6i, and 8i in the J40 Dual-Pocket Cavity - shafted in PX 5.0. This model seemed to move through the ball quite well. I have the same shafts in Callaway X20 Tour, and the J40s seemed a bit livelier going through the turf.
The J40s had an easy set-up for me, and really felt good. (J40s might need to be more upright in lie if I got a set). Give the Bridgestones a try. If you could find a slightly used set somewhere that fit you for lie and flex, you could get a really good deal.