Congratulations! I am sure you're about to embark on the adventure of a lifetime.
"The only man I envy is the man who has not yet been to Africa- for he has so much to look forward to."
First, I'd listen to my PH, if you see an exceptional trophy you may want to take it even if it is not one of your intended targets. Second, I would study the trophy fees, and decide how best to distribute the money. In my experience plains game is generally split up into tiers in South Africa:
1. Animals less than $1000 - impala, common springbuck, warthogs. etc.
2. Animals between $1000-$2000 - Gemsbok, Wildebeest, Red Hartebeest, Zebra etc.
3. Animals over $2500 Kudu, Eland, Waterbuck, Nyala etc.
With the budget you mentioned I would give some serious consideration to a Gemsbok and a hartebeest. They both make great trophies, and I'll bet you can hunt them both for less than $2500.
Finally, these trips are expensive, that's all there is to it. Everyone has different means, and that is ok. But you've flown all the way there, and already spent a small fortune. Don't let a couple grand stop you from taking an extra animal or two if you have the time...Shoot the impala it's only an extra $500.
