Wow, cutting 10 strokes of in 3 months is quite ambitious to say the least, im not going to say unrealistic beacuse I have knocked 11 strokes of mine over the past 6 months. im now off 17 and hope to be off 10 this time next year, I regularly go round in about 10, just not im competitions much.
I rekon, if you are going to be off single figures then the Mizunos or the Pings would be best. I would personally, (out of the three you have suggested) go for the Mizunos, because they are forged, have got very good feedback and the long irons or strong so the ball doesnt baloon up so much.
If I had the money to afford a set that costs the same as those then I would go for the Cleveland Gunmetal TA3's. These too are forged and give an amazing feel and are realy workable.