wow
this is like
"please help me select what to buy for breakfast, lunch and dinner"..
read reviews yourself, decide yourself, it's your money!
in general, all of the above, there are your camera brands, and there are third party brands. save for tripod. tripod good brands include manfrotto, slik, gitzo, benro, giottos.. the list goes on. basically there are different designs, different budgets.
for bags, lowepro, tamrac, billingham, etc.. why not you just go to THIS SITE:
http://www.warehouseexpress.com/Home/default.aspx
they have many brands based on category, the site generally has reputable brands so you can think about it.
there are always china made alternatives. quality is marginally poorer, you pay for what you get, but if you're on a tight budget...