Hehe, nice wishlist!
Sounds like you have a nice trip lined up! Entering at Malelane on the day you travel down from JHB is a good idea for a bit of gate variety. I'm guessing that will be the only day you won't be entering as the gate opens? On all your other days (not travelling so far) this is probably the most essential point for good game viewing - my hubby and I have a motto - if you haven't seen it by 10am you probably aren't going to. It's a bit extreme, and not strictly true of course (cancelled easily by @ the right time, @ the right place
), but getting into the park as early as possible greatly increases your chances of good viewing.
The area around Pretoriuskop is pretty good for Sable so you're staying in a good area for that. I've never seen Sable from Phabeni gate, but have frequently between Numbi & Pretoriuskop on the various little loops around the kopjies there.
Both Numbi & Phabeni gates give you a good chance for wild dog - well, as good as you're going to get with these elusive canines! - and the Doispane road actually has a pack named after it.
I don't think I've ever seen cheetah from Phabeni gate (but have seen lion and leopard frequently - I'm sure you won't mind adding these to your list?
. I have actually seen both cheetah and wilddog within minutes of the Numbi gate early one morning, hopefully the dream comes true for you too! Cheetah seem to like sitting on the stone road markers between Numbi & Malelane which is fortunate as they are surprisingly low down in the grass even when standing and pretty hard to see. Still, as you're aware, rather a rare and lucky sighting if you get it.
Chatting to people in other cars can often be really helpful - if you've seen something interesting don't be shy to flag another car down to tell them, and with any luck they'll be able to tell you about something interesting they've seen in the direction you're travelling. This used to be normal Park ettiquette, but sadly seems to be a tradition which is slipping away.
The brown hyaena would be very fortunate indeed, have you thought about booking a sunset/sunrise drive from the gates maybe on a couple of evenings? It is best to book these in advance as they only go if there are enough people so it's good to let them know there is interest.
Good luck with your quest! Please come back and post a trip report and let us know how it all goes