What Acer model are you looking at?
I use a few of:
Acer S211HL LED Monitor
for about $130 each, 6 months ago
http://support.acer.com/acerpanam/MONITOR/2010/Acer/S211HL/S211HLsp2.shtml
I like them. They are light, bright, VESA mount, 1080p resolution.
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Does refresh...