Only thing I can say about acylic is I would hate to have to clean it. A local guy in my area hates the fact that he went from glass to acrylic since cleaning the corraline off the wall is a lot tougher to do. Maybe he is in the minority but he is the only one I know of with an acrylic tank.
Also, having MH
does not mean you have to have a chiller. I do think it will depend on what you want your tank temp to be. If you are shooting for 76-78 F then it will be tough. If you shoot for 80-82 or 82-84 it will be alot easier to maintain. Having your sump in a cool place or placing fans on the sump can help with temps as well.
I have MH
with T5 suppliments and I love it. I would hate to have to replace 8 T5's very often vs. 2 MH
. I know T5's last longer but that is a lot of bulbs.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,