Yes they weigh more but if plan to upgrade the rods are already there. I personally run h beams each time I build an engine (forged only of course). I'd rather over build a motor then underbuild it.
I feel the same way, thats why I was looking for a forged kit with H-Beam rods. Can never tell when that wild hair might pop up and cause you to build something crazy. Don't want to have to buy the parts over again. Plus the slight bit you may lose by using the heavier parts won't make that big a difference on the street, or on the track if its a street driven car.