I have a topic titled, "Why 10x42s" from last year on this issue. Give it a search. All the guys gave some great info.
10x42s are GENERALLY great. They do ok for medium distance open country and ok for close timber. 8x are great for close timber and pretty good for medium distance (as the difference between 8x and 10x isn't much). I traded the 10x for the additional light, steadiness, and close range of the 8x.
Good luck in your decision
"...I'd rather be tried by twelve than carried by six..."