This thread is more than two years old... It's not generally recommended to revive an old thread like this. People might have gone away, products change, etc.
If you're looking for a cheap ballhead, and accept that it will be cheaply made, then any choice is ok. If you want a good ballhead, accept that it will not be cheap, sadly.
Apart from eventual poor manufacturing, a cheaper ballhead will lack good friction control, the camera can move (down) even after you lock the head, etc. In fact I suggest you read this:
The Tripod Head - Pentax Camera News & Rumors - PentaxForums.com
Then if you decide you still want a cheap head, that's fine. Any head will do, with the limitations you are accepting.