An Iron re shaft is likely to be good option.
You may wish to have a conversation with Jason @ Golf Principles based in Basingstoke. He has a ton of knowledge and a great studio. He can provide you with some good advice as to what might suit your game and your budget.
Well worth a call and a visit and not too far to travel for you either.
He replaced some TT x100 tour dynamic gold from my Vega Irons and replaced them with some KBS tour 90 and that has made a big difference to the feel, club head speed and ball dispersion.
Enjoy
http://golfprinciples.co.uk/