Have you ever had to move a 125g glass tank? Make sure your medical insurance premiums are paided in advance 8O
I have three acrylic tanks and really like them. If your careful with your inetial set up and routine maint, you'll be fine. I generally don't clean the bottum half inch above the substrate. Substrate in your cleaning material can cause damage.
As far as scratches. Small scratches on the inside of the tank are'nt visible to the eye while the tank is filled and running. If you drain it, yes you'll notice straches on the inside. Small scratches will accumulate from routine scrubbing/maint.
For minor scratches on the outside. I use plain ol car wax to buff them out. Wax the outsides of my tanks every couple of weeks. Water droplets run off the outsides of my tanks like greased lightning
Keep in mind, large tanks need a strong foundation to rest on. With water being over 7 ppg, the wieght savings of acrylic vs glass can play a part in the factor.
Im currently in the process of planning a large tank between 100-150g. I can get great deals on glass tanks in these sizes locally. Where as the acrylics at that size are three times more. I personally don't like the look that thick glass cast on large tanks. Therefore I've been scouring the local classified and e bay for acrylic. Theres always someone that gets in to deep and just wants to get a big tank out of thier house. In the past couple of months, I've just missed six large acrylics. Someday it will be mine
Theres a ton of info on the net on acrylic tanks. The best thing you can do is research. Figure out whats best for your application and build from there.
HTH