Question about road bikes?

I'm 26 of age what is a good road Bike an a little bit of trail not a lot, an what size bike do i need since I'm 6' 2'? Also i would like to get a Mountain bike in case i go to the extreme trails an really get down an dirty.. I hear the word 29er alot what is exactly meant by 29er is it better or something ? My budget is 950.00 for a hybrid an for a mountain bike 2,700 what is the best brand bike ?