1229.
Not to say a 1224 won't sound good, but the 1219 and 1229 decks were some of the best Dual made.
If you're looking at a 1229, be sure to check "single-multi" lever at the base of the tonearm. If it's frozen DON'T FORCE IT!!! You could break a very difficult to replace part.
If the lever is moving freely but the tone arm doesn't move with it, that difficult to replace part is already broken.