I wouldn't even consider that Aperion 4B setup for anything larger then a dorm room... 4" monitors and an 8" sub for a 15x25 theater? Very bad choice.
The HTD level 2's would be a solid choice, minus the sub. Subs do not "match" like your front three speakers should. A pair of these JBL subs for the same price as that HTD would be a better choice http://www.newegg.com/Product/Product.aspx?Item=N82E16882665157