The main differnce between a wood and an iron is how deep the face is. Since irons arn't deep at all you can hit down on them and your club sinks into the ground making it easier to put spin on the ball. Since you can put more spin on the ball then the ball becomes more workable. Also since woods have a deeper face it makes them harder to hit off of down hill lies, where it isn't soo much of a problem with irons. Although this wont help you at all if you can't hit your long irons. I would deffinatly put a good look into some hybirds.
Woods are better than long irons but hybirds are the best of all. Even great players on tour that can ht their long irons with no problem prefer the workability, forgiveness, and distance of hybirds. My I recomend the Taylormade REscue Mid, Sonartec, and Mizuno CLK
The main problem with woods is the lack of pinpoint accuracy. The hybrids fix that. Long irons are hard to hit high. Woods fix that, but hybrids fix that even better. My point is, hybrids are the better choice, especially for a higher handicapper. However, if you like the 7 wood, keep it. You always want a confidence club that you trust. If your equipment works, don't mess with it.
Woods are better than long irons but hybirds are the best of all. Even great players on tour that can ht their long irons with no problem prefer the workability, forgiveness, and distance of hybirds. My I recomend the Taylormade REscue Mid, Sonartec, and Mizuno CLK
Note to high handicappers! The sonartec is a great hybrid, but is a little harder to play than the other two. Test it before buying it, because it might not be right for you (or you right for it)! However, if you can hit it, it is a great club.