Want to Invest in a Heavy Bag

[The Victim]

I'm looking to buy a heavy bag to put in my basement. I weigh 147 and im about 5'7". I need a durable bag with a fill that won't settle severely. I'm just wondering what kind of bags do you have/use and how happy are you with it? I've been looking at:
http://www.amazon.com/Everlast-100-Y...ef=pd_sbs_sg_1

http://www.amazon.com/Everlast-100-P...ref=pd_sbs_sg1

AND

http://www.amazon.com/Everlast-Black...ef=pd_sbs_sg_6

I'm in a dilemma not knowing whether I should do 80 or 100 and which bag is a good one.

[Fearless]

I'd personally go to a store and test it out and see which one suits you. I went to a gym that had a boxing room with like 8 different bags (including a uppercut bag, a wrecking ball and a banana bag) at my disposal, I liked the nameless black one that they had because the bag was hard enough for me to hit, and the snapping sound was music to my ears.

Just give it a punch or two, don't be one of those fools who go in a sports store and think they can box.