i have a AM 2013 jekyll 3 medium and currently weights about 30-31 pounds. everyone seems to suggest i should start with the tires and wheelsets. the current factory setup has

shimano mt68 weighting 1960g
schwalbe hans damph 26 x 2.35 tires front, 765g
wtb moto 26 x 2.3 rear tires, 825g

i am considering upgrading the wheelsets to
mavic crossmax st or crossmax slr

crossmax st, 1590g
crossmax slr, 1140g

i am also considering change the rear tire to a schwalbe 26 x 2.25 racing ralph, 550g

should i bite the bullet and upgrade the tire and wheelset? if my calculation is correct, i shave only 795g.