My trip to RSA in 2007 probably cost around $14K including taxidermy, shipping and airfare. Zim in 2010 cost around $30K all in.
Jay, if you want cape buffalo then you owe it to yourself to hunt them in the truly wild places. The Caprivi Strip in Namibia or Mozambique would be my top 2 choices. The Caprivi great genetics out of Botswana...I find they tend to be heavier in the boss. I hunted out of the same camp as PH Jofie Lamprecht in 2010 and he has pulled some astonishing buff out of the Caprivi in the last few years. I would hunt with him in a second if I was going back there. Mozambique offers a choice of either floodplain hunting (very challenging) or mopane forest in the North. Personally I would go for a hunt in the North and hunt like the old-timers did in Tanzania. If I took that route I would hunt with JP Kleinhans. I've met him and he's a very good guy.
Now for the scope. It's no secret that I love the 1.5-5x Leupold. Unnatural man love. But I think a 2.5-8x would serve you better, especially on a mixed bag hunt. You might see a great impala on the far side of a clearing or in a dry riverbed and have to take a 150-200 yard shot. In a case like that I'd rather have a little more magnification. Or, and probably more importantly, you might see a real elusive trophy like a honey badger or civet at a distance. There is no way in hell you will be able to stalk up on either of those animals, both the size of a large badger or really large raccoon, and you will have to hammer them from wherever you happen to be. I'd err on the side of caution. Not that you can't make long shots with the 1.5-5x (my longest was a lasered 287 meters on a springbok) but it's better to have and not need. I didn't ever have mine on 1.5x except walking back to camp in the dark through rhino country.
Either way, congrats on the new rifle. Now time to find some 300gr Swift A-Frames and work up a load!