There's too much variation to give a definite answer of 5 ply vs 7 ply. If you can narrow down some particular blades, this forum has some of the most wholesome equipment reviews I've found.
You didn't state if you were a high spin oriented offensive player or prefer to hit hard, that would dictate whether someone should recommend you a flex blade or a stiffer one.
5-ply
Violin
Andrzej Grubba
YEO / Adidas Avenger 5
The first 2 blades really stand out to me for high spin. I actually prefer the Grubba, because it is easier to push with and the spin generated on away from the table loops is tremendous. My game points are typically won by out looping opponents in spin variation and placement. I find it more satisfying than overpowering them with brute speed.
The YEO is a good middle ground blade in that I didn't find it the best for looping, but i can generate decent spin with it. However, I could flick serves , block and loop drive some winners much easier than I could the 2 aforementioned blades.
Keep in mind during your search what rubber you plan to use with them, as this can either make a good combination or a setup you can't wait to get rid of.