A few things to cover here, first the bow.
Top 5 this year will be the Mathews V3, Hoyt RX5, Bowtech Solution, PSE EVO EVL 32, and Elite Enkore. Do some looking into each one, and find a shop that has one or more and go shoot it if you can. Thats really the only way to be positive you like it.
Sight. Spot Hogg is my choice, very solid and bright, with great options. Grinder for a regular fixed 5 pin, Fast Eddie for a slider. Black Gold is another popular choice.
Rest. Hamskea is the top of the game for limb driven, QAD seems to be the best for cable driven.
Arrows. This is the piece that could go a lot of different directions. Ideal total weight for me is 450-500gr total weight and 10-15% FOC. So your GPI is pretty important if you have a specific goal. I currently shoot Easton Axis 5mm arrows with 300 spine, 10.7 GPI with 175gr total weight up front for a 12% foc. Easton is a solid arrow choice, but there are other options as well, Victory, Black Eagle, Gold Tip...maybe more but those are the ones I can think of.
Broadhead. Mechanical would be my absolute last choice for elk. A fixed blade cut on contact is the ultimate for reliability and penetration. I have shot QAD exodus before, which seems to be the top replaceable blade that has nearly cut on contact performance. I will be using Iron Will 125gr broadheads this year with the bleeders. I also have the Iron Will insert and collar system behind the broadhead for more weight and strength at the front of the arrow.
Broadhead tuning will be the most important step in your setup phase. Making your field point and broadhead fly with each other at all distances will mean your bow is happy, shooting straight, and the shot is efficient. Paper tuning is a good start, but bareshaft at distance and then broadhead, will be the final step.
Another small but possibly important thing is the peep, obviously it needs to be sized for you and your sight, but the shape and design can be a noticeable thing as well. I got a Hamskea raptor peep this year and it's awesome. It can handle a little twist and helps cut down on any glare. I went back and shot my old bow with a standard peep and wouldn't go back to that style.
I'm somewhat obsessed with archery so I like to get really into the details of stuff, but this is as quickly as I could give an overview of my thoughts on a full setup.