Even though a 215 cabinet cannot match the sheer volume of an 810 cabinet, many old 215s do, or can be made to sound very good.
Case in point: my highly modified Peavey 215. This old cab has been stripped of its origional tolex and recovered with Duratex. The interior has been lined with 1 1/2 foam (available at WalMart for around $11). The top speaker is a 8 ohm Black widow, the bottom is a JBL K140. So a 4ohm cabinet can accept the full 200 watts from the GKMB200. I also installed skid rails on the back of the cabinet, for easy loading, and to top it off, installed a guitar hanger on the side.
To VanillaThunda: I also own one of those old Kasino 200 amps and still love it to this day.