Under Seige was good.
Hard to kill was awesome, that montage where he is strengthening himself by performing acupuncture, running up hills, sitting around with scented candles and ends with him punching a piece of timber wrapped in rope in half is brilliant.
Out of his post Half Past Dead straight to DVD efforts it's difficult to find anything decent, Into the Sun I think it's called is one where his daughter gets kidnapped in Thailand and he goes over and kills a thousand asians and has a fight with a tranny is pretty good.