You also have to take into account that getting a certain number of reps with a particular poundage doesn`t always translate to a projected one rep max effort.
I have seen tons of guys do plenty of high reps, but were not proficient at doing low or one rep maximum lifts.
It`s a whole different animal,especially if one is not used to doing triples,doubles,or max attempts.
5 X 5 with a constant poundage is a good way to go IMO.........when you complete all sets of the 5 X 5,add 15 or so pounds to the bar when talking about deadlifts, and do that weight until you complete 5 X 5..........rinse,wash,and repeat.
Starting out a bit lighter will ensure good form and you won`t hit your peak lift and plateau too early.