Hey choco,
If you are just looking for some input then here are some of my thoughts....
I have two acrylic tanks and love them both... One is a 7.5 gallon cube,(don't know the manufacturer sorry, some plastic company on the west coast)and the other is a 30 Tall made by Sea Clear... setting up another tank soon which will be acrylic as well. I was originally a little aprehensive about acrylic in the beginning due the the whole scratching easily thing. Deal is, I have to be careful and have put a few scratches in both tanks but the beauty is that you can polish them out, rather easily actually. The scratches I have in my glass tanks are there forever!! Acrylic is indeed way way lighter than glass, more optically clear, way stronger. I have had two glass tanks crack due to them not sitting level (won't even start on the level thing, old houses are cool but they got probs, hehe). There is the insulation factor as well, does much better than glass and so on an so on. I do have to say the biggest appeal to me though is the asethics of it all.... It is just way cool to have this uninterrupted view of the inside of the tank, no glass butt joints on the corners with silicone smeared on them, (silicone can degrade and potentially leak not to mention the time one of my cats unbeknownst to me was clawing at the seam on a 75 gallon glass hex, "Honey, why is the floor wet??" ((cat is now declawed!...lol)) Acrylic just looks cool! Oh yeah, no black plastic cross brace shadowing anything....
Okay nuff said, I talk to much!...lol No faithfull glass tank owners jump all over me okay, I have glass tanks TOO! I love them all just kinda partial to the plastic ones *grin*