research all you can on line --when you think you found the one you like - try to get to a store that has it in stock, take a target with you with holes punched in it and walk off 200 yards. view it now-- if you can see the holes easily, then it's a decent scope and should work ok at the range.
i went thru 3 scopes thinking that they were good until i learned -- you gotta see the holes at 200 yards.--before you buy it. i found 40- 60 x worked best for me.
angled vs straight is mostly a matter of choice and comfort.
the stands are just a personal preference also - they all run about the same .