If room is not an issue then yes, go ported. I would get a single PB3000 over a pair of Klipsch subs. I think it would perform better for you and then save for a 2nd one.
I still own a small 10" ported Klipsch sub so I have some small experience with them. There is just no comparison between it and better quality subs from some of the manufacturers who specialize in them. Another brand to consider would be Hsu. I have a pair of
VTF-3 MK 5's (price in that link is for 2 of them) in a very large room and they perform fantastically. They didn't cost an arm and a leg either. I think Hsu is about as good as it gets, bang for buck. If I had the money tho, I'd go SVS all the way! I just love their look and style.
A step down and a little easier on the pocketbook from the VTF-3's would be
VTF-2's. I haven't heard them myself, but I can vouch for their big brother whole heartedly. Price in that link is for 1. They done have a "dual drive" package for the VTF-2's.
*Edit: Not in the states AND room is an issue. Nevermind, lol.