I would get 8x42 or 8.5x45. 10x do not require a tripod (although it would help), but they will shake more than 8x and it is noticeable. Go to the store and look through the same model in 8x and 10x and you will see the difference in how easy it is to hold them stable. It's best to do the comparison outside at longer ranges. I use my 6x and 8x most of the time. I use my 10x when I hunt wide open spaces. I would be all over those 8.5 x 45's if they aren't too big. They will do you better in low light at the beginning and end of the day. I have some 8 x 50's that I use when I don't have to walk far because they are big, but they are amazing in low light. I bought a pair of 12 x 42 Nikon Monarch binos 3 years ago. That was one dumb purchase. They shake so bad I thought I had Parkinson's. They are going up for sale when I get around to it.
You wouldn't happen to be looking at the Vanguard Endeavor ED binos, would you? They are the only one I know of that offers a 8.5 x 45. They are supposed to be awesome binos for the money. Bird watchers rave about them, and they know binos.