I'm 5'10" too, and tried both the 16" and 18" before buying - the 16" had a better and to cross bar gap, but felt a bit cramped for between the saddle and handlebars. So I ended up with the 18" as it just seemed better. The seat's a bit low for me on the photo below.
Granted it's an LTD and not an Acid but there isn't much difference in the frame sizes between the two