There are many good fixed blade broadheads on the market when going after moderately large game. The key is to pick a weight that matches the dynamic spine of your arrows coming out of your set-up. Good flight with optimum penetration trumps design almost every time. Good flight comes from broadheads that perfectly match the arrow spine and penetration will be related to how straight they fly and how much weight you can get towards the tip.

ok, straightarrow, so good explanation.
I have easton axis 400 spine arrows with 4" vanes
I shoot 54# through a WB with a release.
so what type of Bhead would u use ?

I don't think the "type" matters much, until you start hunting extremely big game. Even so, I always go with more traditional looking 2-blade heads that are easy to sharpen, and very strong. What's important is to make sure the weight is correct for your arrow's dynamic spine. You must be able to adjust your arrow length and/or draw weight to match the arrow perfectly with the particular weight head that you choose.

This involves bareshaft testing until you get the correct flight on the bareshafts at a distance of at least 20 yards. This is easier if you choose a shaft when you choose the broadhead. Since you already have the shaft, you have to guess on the ideal weight head, keeping in mind the length of shaft, draw weight and agressiveness of the cam you're using.

so, in your opinion then, would using 100gr muzzy's be a good idea ?

I don't ever think using a broadhead that light is a good idea. However, it may be your only option, depending ont he variables I mentioned above.

Personally, I would always do the bareshaft test to see what weight tip will fly best, at what draw weight, and what arrow length. This is a dynamic process and changing one variable affects the others. The shortest shaft at the lightest usable draw weight will result in the heaviest head your setup will allow. You must test to find your answer. Otherwise guess, or take some stranger's advice and hope you get lucky.