I would recommend mixing in some cribbage as well, especially once you get to the point where you are getting out at 8-ball fairly regularly. I'm sure you can find cribbage rules out there somewhere, but here is a quick rundown:
- Open break (take bih after if you are playing the ghost)
- Pocket balls in pairs that total 15 (3/12, 2/13, etc.)
- Each pair pocketed nets 1 point
- If you pocket one ball and fail on the second, spot the first ball
- If you pocket multiple balls on one shot, you must make the companion balls on your next shots. So if you pocket the 4 and the 10 on the same stroke (on the break, for instance), your next two shots must be the 11 and the 5, but not necessarily in that order
- The 15 ball counts as 1 point, but must be played as the final shot of the rack
I think cribbage is a great game because it gets all 15 balls on the table and requires solid pattern management and cueball control. The trick is to plan 4 shots at a time - find a manageable pair of balls you can pocket and plan how the final ball leads you into the next pair, at the same time planning ways to deal with problems such as clusters that need to be separated.
I prefer it over 8-ball because it forces you to control whitey a little better once you commit to a pattern. I also like the fact that, as a two-player game, it offers more opportunities for strategy and defensive play, especially late in the game.
As far as the ghost is concerned, I think it is far more useful as a rotation game. You can rack 3-ball, 4-ball, 6-ball, 7-ball, etc., and how you perform up through the difficulty levels is a great yardstick to measure your offensive prowess. I guess you could play a short-rack 8-ball ghost game by using a 9-ball rack, though. Just use 4 stripes, 4 solids, and put the 8 in the middle.
Aaron