Only you can answer that question. But I wouldn't base my ability to play blades on how well I hit a wedge. The sweet spot on any wedge is going to be much larger than, say, a 4 iron. Demo as many clubs as you can and go with what gives you the best opportunity to score.
On a side note, I've noticed a trend lately in mid-handicappers that really want to make the switch to blades and seem to think that such a switch would help their game. Pros and low handicappers play blades because they are good ball-strikers. They aren't good ball-strikers because they play blades. The whole chicken vs. egg thing, you know.
Id pass on the blades. Theres really no reason for anyone to play blades anymore. You cant really use your Vokeys as a comparison because the shaft is shorter and they have so much loft.
Ive got an old set of Mizuno blades that I keep around just because I think theyre beautiful irons and I take them to the range sometimes but all it takes are a few mishits to remind me why I play SGI irons and not blades.
It's a hard comparison to make, you have to factor in lofts of each iron, proper shafts, etc. I don't know the answer with 100% certainty but I'm pretty confident if there is any difference in distance between a blade and cavity back set of irons that are properly fit for you, it's a negligible amount. I've seen reviews where the sweet spot on a blade is about the size of a dime where as the sweet spot on a GI is about the size of a golf ball.
All that said, the blades they make today aren't are difficult to hit as the ones Hogan played. Even the MP-69's and Titleist 712 MB have some forgiveness built in. If you really want to put some blades in your bag and not kill your scores, consider a combo set 3 - 7 CB & 8-P MB. Some wedge companies like SCOR offer lower lofts that allow you to replace your 8-Lob with blades while keeping your current lower lofted irons to create your own combo set.
My clubs are not really blades but forged cavity backs. I like them for the feedback they give me and I have always played with older clubs some of which were true blades. I have only owned one set of "forgiving" irons and did not really like them, probably because they were not fit to me. They were Adams Tight Lies. I do not think using these older clubs has hurt me at all and my scores would be just as shitty with newer game improvement irons. Lately, I have been striking them pretty well since I got back into playing after years of not playing much at all. I had a tough time adjusting to the 460 degree drivers as I had been using standard heads, persimmon e.t.c. I do think however, that if I had a set of newer irons with fresh grooves, I could tell the difference around the greens. My short game is decent, but would probably be better with a little more bite. I wish I could afford a set of Mizuno Blades. I am still looking for some older Hogan's in good condition, but most are pretty worn. I really want a set of Apex's or even Apex II. I might settle for a set of Directors. I currently game Hogan Edge. My son is supposed to return a set of graphite Hogan's that I gave him several years ago. He says they have been well taken care of. We will see.
I like that! Pretty good analogy as to the "who" and "why". Same could be said regarding the technical aspects. I could care less about A-1, A2, A-6, Launch Angle,. MOI. Just tell me how to swing the club, make shoulder turns, keep hands inside, e.t.c.
Maybe you should be worried about those things.
While most of the magazine ads would seem to suggest this is the only criteria one should use in deciding if they need new sticks, I would propose that a more appropriate criteria would be which clubs you, the individual golfer involved, can repeatedly hit the same distance very consistently! For me, knowing which club to pull for a 150 yard shot, and having confidence that I am picking the right club, is much more important than whether it turns out to be a 5, 6, 7 or 8 iron. And I believe that the "game improvement" clubs will give most people more consistency.
For the OP; if you're wanting some new sticks keep in mind that within the broad category of "game improvement" there are clubs aimed at different levels of players. Titleist AP2, Ping i20 and Mizuno JPX 825 Pro come immediately to mind as "players GI" clubs. One of these days, maybe I'll get my game together to the point of wanting some of those. Right now, I still want all the forgiveness I can get.