Pip,
You'll have a blast, and as mentioned above, I can almost guarantee that you'll be planning to return before you get on the plane home!
Only suggestion I have that I have not already related to you concerns your animal wish list: Virtually everyone that hunts Melorani has a gemsbuck and zebra at the top of their list. However, these are very tough animals to take as they are very weary of the waterholes/blinds and are tough to stalk.
My advice: Because zebra and gemsbuck are such a gamble (and female gemsbuck are off limits), if they're on your list you may want to consider nyala if you haven't already. The trophy fee is up there - $2500, about what you'd pay for a gemsbuck and zebra together - but Stewart has an great nyala herd with soom impressive bulls, and you should get at least a couple opportunities at a nice one. They are impressive!!! Waterbuck did not appeal to me, until two absolutely huge bulls came in one afternoon (no shot though), so something to consider too if you haven't. I would also not hesitate to take two impala - Stewart has a great herd and a lot of good rams, they make a nice mount, and are relatively cheap (about the same price as a warthog, but I doubt that my wife will ever permit more than one warthog mount to grace our walls).
Based on my experience and that of my partner, I say that you:
1.WILL have multiple opportunities to take kudu,impala, nyala and possibly blue wildebeast.
2.Will most likely have a shot(s) at waterbuck, blue wildebeast, eland and warthog. The later took a beating in 2007 and I don't know if their numbers will recover substantialy by 2009; certainly they were as much a given as in the past.
3. May have a shot at hartebeest, tsesebe [sp], zebra and gemsbuck.
If you are going to spend the big bucks on a sable, I'd say your chances are outstanding for a nice bull.
Blesbok are on Stewart's new lease, and they seemed fairly abundant, but I did not hunt them so I can't say what your chances might be.
I may have missed a few species, and again, this is based only on our one hunt at Melorani last July, though the part about the zebra and gemsbuck was related to us by Stewart as well.
Have a great trip!