your subwoofer can be from any decent manufacturer you like.
Klipsch HD500 set is on the "very small" side for a room that size. 2.5" drivers in the speakers and an 8" subwoofer just are not going to create much of a soundfield in your 16x16.5' room.
Is the criteria "budget" or must the speakers be "small" for esthetic's ? Bookshelf vs. towers vs. in-wall vs. small satellites ??? Let us know your requirements here.
Klipsch HD500 set is on the "very small" side for a room that size. 2.5" drivers in the speakers and an 8" subwoofer just are not going to create much of a soundfield in your 16x16.5' room.
Is the criteria "budget" or must the speakers be "small" for esthetic's ? Bookshelf vs. towers vs. in-wall vs. small satellites ??? Let us know your requirements here.