Welcome to AH VanderLa
I can only give you advice as to what I have Experience in. I did My first Safari last year My wife came along as an observe I choose RSA as my first because of such great prices and packages. I hunted at
Huntershill Safaris in the beautiful Heuningklip Valley of the Eastern Cape, South Africa, is your premier hunting safari destination in East Cape South Africa the amount of game seen there was outstanding compared to what I could find in the same price range in Namibia and the size looked better.
As to whom to go with as stated I hunted with Huntershill safaris and will give them the Highest Reccomendation My wife was ready to move there by the 3rd day of the hunt. That being said you will find more then I can count on the outfitters page and all of them good depending of course on the thickness of you wallet.
as far as time make it as long as you can afford to I went for seven days and didn't want to leave planning one for next year 10 days.
and the 30-06 for the game you want to hunt should be fine just use good Quality Bullets Barnes X or GMX if you don't reload then try the Hornady custom load in GMX.
as for Taxidermist I had all 9 of mine done there a little spendy but in my mind worth it ie $4000 for taxidermist work 300 for Doc. 2000 for shipping by air sound spendy but figure it out if your capes get damaged or even ruined. it's not the same if they replace it, it's still not the one you shot.
Good luck on your hunt your on the right track Researching it now.