From the websites you linked, it states there that the maximum VGA card length for the Cooler Master K380 is 316.6mm while the Aerocool PGS Vs-9 is 295mm. With that information, the Gigabyte R9 270X (with a length of 297mm) would fit in the Cooler Master K380 and not in the Aerocool PGS Vs-9.
There are other cases that could fit your graphics card in that price range. It is hard to recommend cases since it is up to one's personal preference in terms of style, size, color, etc. But here are a few that could fit that graphics card.
http://pcpartpicker.com/part/corsair-case-cc9011036ww
http://pcpartpicker.com/part/corsair-case-300r
http://www.newegg.com/Product/Product.aspx?Item=N82E16811854004&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119298&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
http://pcpartpicker.com/part/corsair-case-400r
If you have other cases in mind, just Google that case's spec sheet and take note of the maximum VGA/Graphics Card length that could for in that case.