I don't want to know how much I have spent on camo, and if I did I probably wouldn't tell you. That being said, I am a firm believer in "you get what you pay for."
For warmer weather, I found any camo that blend into your environment and is quite is fine. I feel in love with Rocky for the thin stuff, even has scent control similar to Scent Lok (does it work? not a clue). Very comfortable to. You can tell if what you are buying is going to be quite by just rubbing the material across it self and seeing how much noise it makes. Any Cabelas or Basspro stuff is quite most of the time, as well as cheaper stuff (which is good and that I own and use) that you can buy at Dicks. It all ends up being around the same price either way.
Cold weather, Im a snob. I get cold quick and layer up like crazy. Any combination of Cabelas Revolution Fleece is some of the best for staying warm and dry and windproof for the most part. I also use Walls bibs and Jackets. Its important to note that bibs and jacket is what gives you more maneuverability, I don't recommend pants unless you have a longer jacket to cover up your back. Coveralls are okay, especially when it is cold and windy. The key really is layering, start with good thermals and socks (ECWCS comes to mind, polartech stuff). put whatever else on in between then your outer layer. Maybe not everything in between, but stick with fleeces if you can.
Try on as much as you can and do the rub test on everything you might buy for hunting clothing. Also make sure you can draw your bow, shoot your gun, and maneuver around your stand, or stalk comfortably without feeling too bulky or clumsy.
Hope that helps.