I've killed deer with old wasp cam locks,muzzies,and slick tricks.They all do the job if you put them in the right place.Every broadhead needs to be shot out of a tuned bow but some broadheads,because of their design are easier to tune.Short fixed blade heads such as G5 strikers,slick tricks,wasp boss bullets etc are some of the most common.If your bow is tuned,you have no fletch contact,arrows are spined correctly,you use good form and have them screwed on strait,you should be able to get excellent flight at just about any speed.It's also important to use a BH that will stay together and not break.
For the past several years,I've used slick tricks to take over 30 deer.I've get perfect flight at 320+ fps.I get a passthrough every time and I've never busted a blade.In fact,I've killed as many as 4 deer with the same head and blades.Out of approx 30 deer,only one has run out of sight.I'm not saying their the best head out there but they're the best performing head I've ever used.
You're smart to not get all caught up in marketing.I have the opprtunity to shoot alot of deer every year and I also get the opprtunity to see alot more get killed and wounded.One of the biggest fads today is to use as big of a cutting diameter as possible.I can tell you from pretty extensive experience that BH diameter is the least thing you should be concerned with.I've killed loads of deer with huge heads and even more with standard size heads.Shot placemenet,durability and penetration are the three most important things,in that order,period.I've blown huge gaping wounds through deer with Wasp Jackhammers and slick trick grizztricks.The results are the same as a standard sized head if shot placemenet is equal.