Solid Hardwood, Engineered and Laminate Flooring - lock and seal? please help

I am looking for a good laminate floor but I am pretty clueless on what brand is a descent floor. I don't want to spend a fortune on something that is as good as the stuff in sam's. I have been on the net almost everyday trying to find info about the different brands of laminate but there is not any comparisons to be found anywhere. I do know that I want an AC rating of at least 3. I have been looking at Quick Step Eligna and Home series and found it at Woodhaven for 2.65 a square and 1.99 a square for the Home series but I don't know the diff between the 2 series. They are both made from Quick Step but why the price diff? I want to do 2 bedrooms, a hall, and a landing( about 450 s.f) so I want a descent company to go with. Any advise will be appreciated.Thanks:wall:

I've been researching this for the last few months and we are about to install laminate flooring on a concrete slab - this is what I've found out:

Several good brands out there - Shaw, Mohawk, Pergo
Go shopping around to different flooring stores and get educated.
Flooring should have NO bows or curves - should lay flat as it lays down normally and on the edge.
Humidity does affect it! Should be between 35 and 55% humidity.
Go with 7mm-8mm thickness.
The manufacturer websites usually have good info on selection, installation, etc.
Must go on a flat smooth surface, otherwise will have problems. Needs to be relatively level, but not perfect.
Read the instructions!
Doityourself.com has good information.
Hope this helps.