What iron shafts should i get?

I am starting to look for a set of Mizuno MP 67s, maybe on ebay, but need to know what kind of shaft to get. Right now i play Titleist DCI 990s with Rifle FCM 6.0 shafts. They are pretty old, i am the 3rd or 4th owner and i dont know for sure if the shafts are for me but i hit them well but a little low...i have a history of a steep angle of attack with my irons that i have been flattening out a little more and dont hit the ball specially high, i would say i have a mid-low to mid ballflight with these irons. I seem to keep my handle pretty far in front of the ball at impact but still in a mechanically sound manner. I hit a slight draw for my stock shot too if that matters.

When i have hit at a launch monitor at Dicks, i have had a swing speed for my driver at about 100 and a swing speed of about 88-90 with a 6 iron. I have a somewhat quickly paced swing at times but i try to keep a little smoother of a tempo.

Just for more information i will also show you my iron distances.. These are the distances that i find i get when hitting them into the green, not specifically the carry distance.

3-210
4-200
5-190
6-180
7-170
8-160
9-150
PW-140

I know this is a lot to read and all, but i greatly appreciate any input...thanks!

I wish I could help you, but don't have your swing speed. I envy your iron yardage. ;)

thanks, i envy your handicap... i guess i am mostly wondering if DG S300s would fit since i can find set with these shafts much easier and cheaper on ebay.  From what i hear they might now cuz they go low but i dont have experience with them...i know i should get fitted but that costs money and i am cheap..haha thanks.

Dynamic Gold S300's or Project X 5.5.

I'm a fan of the Rifle 5.5's, didn't like the PX as much.

Go find a golf store with a Mizuno fitting cart and ask them to type you on the shaft analyzer. Only takes five minutes and will probably give you more substantive feedback than you'll find here. Also free if you act like you're really keen to purchase a new set of Mizzies.

And I am!  but for less than half the price that they will be selling them for haha.