Strings all come down to personal preference...it's not that big of a deal and don't let someone tell you otherwise.

Learn to string your own guitar....such a waste of money to have that done every time you snap a string. Adjusting action height is usually done at the expense of twisting a set screw or two...don't be a douche.

well you probably can't fix your buzzing problem without adjusting the bridge sorry. changing the strings won't help.