You're starting down a very fun path!
A true flying broadhead is super easy to find.
..the trick is tuning your arrows to fly well.
Very close second to that is your form.
Thirdly is mounting your head straight..which is really pretty easy.
..they need to be at least pretty darn close.
With screw in heads this is basically done for you.
With trad bows 10 grains per pound of draw weight is about the norm for total arrow weight. Some go higher..some lower.
..Normally those who shoot lower draw weight bows tend to use a little more than 10gpp in order to have some more momentum.
Your shafts probably weigh around 275 grains.
the 100 grain tip will put your at around 375 grn.
The 125 will get you to at least 400 grns total.
That will do the trick on a deer.
I'd personally go with a 175 grain or more head.
Most "trad" heads made these days are pretty darn good.
The lighter the head the less tough they are...in general.
But still more than tough enough for most animals.
You hit a shoulder bone and you can wreck even the best heads.
I have found it frustrating at first to learn how to sharpen single bevel, double bevel, and 3 blade heads.
But I find it very rewarding having done so....In time maybe you will to.
For the truly easiest to sharpen, more than high enough quality head I'd have to say using an accusharp sharpener ($10) and some screw in double bevel tuskers of your choice of style and weight from
http://www.braveheartarchery.us/tusker_broadheads.htm The reason I vote for the tuskers is they're a good head that only have one thickness of steel through the blade. This makes them even easier to sharpen with the accusharp.
The tri-lam tips on zwickeys and other blades with similar designs are a touch harder to sharpen evenly.
..hope this helps.
Good luck!