Start with high quality boots and pack. Those are the two most important pieces of gear when you start getting into the high country. These two items can literally make a world of difference in whether the hunt was enjoyable or a something you would not want to ever do again. Read some recent threads blisters and pack fit.
One other important question is do you plan on going solo or in a group. If in a group then shelter options open up as weight can be shared. If you plan on going out with 3 or more guys and sharing a shelter, tipi is the way to go. The companies you mention are all good. Throw in a stove jack and pick up an ultra light stove and you will be good to go in all kinds of weather.
Sleeping bag, I would highly recommend going with a quilt, they are light and warm with an excellent ability to regulate heat. I went with a quilt this year and will never go back to a normally sleeping bag. I slept soooo well on my hunts this year I had a hard time wanting to get out of bed. First time ever, usually I am restless and moving all the time, waking up etc... but this year with a quilt I slept like a baby. Awesome! Read Littlebuf's reviews on the Revelation X 20 degree quilt.
http://www.rokslide.com/forums/showthread.php?6186-revalation-x-20*-long-wide&highlight=quilt
That's what I used this year and I can't say enough good things about it. Buying my wife and kid’s quilts, no more sleeping bags for us.
Get a good sleeping pad, lots of good options under 20 oz. Look online for sales, this year I pick up a Hyalite Equip Classic AC pad (R-value 2) 15.9oz - from campsaver for $20 and I had no issues with it what so ever.
Get a havalon and NECK knife - under 5 oz for the pair and they will do everything you need from deboning elk to camp chores.
We need more specific questions to give better answers but if you search gear lists you will see similarities in what gets taken in and what doesn't. There is differences in what I call creature comfort stuff, as people develop their own needs/wants, but generally the basics are all the same.
Hope this helps.. but don't be afraid to ask questions, especially after you do some reading, the more you read the more questions you will have.