hunting GPS?

[Baylian]

I want a GPS unit that I can use to hunt with and backpack with. I definately would want one I could down load Topomaps on. I would love to have a way to mark where I left the kill. Trail marking for a bushwack would be cool too but I have just started researching this and don't know what I need or don't. What's the best bang for the buck? Please advise.

Thanks in advance, TJ