Depending where you are going and what your goals and finaces are... I would definitely advise having a backup plan in place if you come across an animal that really trips your trigger but was not planned for.
That $1000 will likely suffice for an extra mediun sized antelope. Or two or three smaller or at least cheaper ones. Look over the price list from your outfitter and see what you can get for that $1000 before you buy the gun... that is if finances are tight. If it will not make a real difference financially and you want the gun but just want to know your getting a good deal, buy it! And if you need a bigger gun for this trip and this is what you want, buy it.
On the other hand, if you are going for plains game only, the 30-06 is all you need, esspecially if you shoot it well.
Another way to think about getting a good deal is to think about the overhead expence you will have into the trip... and "net present value" of this hunt to you, in financial and overall expieriance values.
No matter how long you are over there and weather you take take one trophy or 100, the flight, gun transport and permit, as well as other travel related costs are the same per trip... Thus the more you do/take while there, the less per animal/expieriance you will have spent for travel. If you spend $3000 traveling and take one animal, it is $3000 per animal travel expence... if you take 10, it will drop that to $300 per. That is only the most obvious, but the same could be said of your daily fees, practice ammo, range time, new binoculars or whatever.
So then if you look at the net present value of buying this gun, assuming you don't need it for this trip... and just for fun we anylize this as though harvesting trophy animals is the purchase being anylized.... And if you use thart $1000 to take more trophies now thus diluting out their overhead.... you can likely afford to pay way more to buy a 375 later.
Additionally, future dollars have less value than today's dollars, so the same gun can be bought for more money in the future and potentially have the same or lower net present value.
So, buy the gun if you need it. Also buy the gun if you can afford it and will not have to sacrifice something else you want or need more. And buy the gun if you want it more than you want to be able to shoot more critters on your trip. But if the trip and the experience is the main goal... and getting the best overall deal and value is your goal, you might not only want to not buy this gun now, but may even want to sell or be prepared to sell that 308 or whatever to put towards trophy fees.
Good luck with your decision and have a great hunt!
So, I tell him to google it and sure enough it does exist! 
However, this revelation does not change his rude tone throughout the conversation...gun not made anymore blah, blah ...they are the only Canadian authorized repair shop...wait, what was that? Now I get the warning that any unauthorized repairs will void the warranty. 
!
. There are a lot of things to consider in planning for a hunt in Africa, that's for sure!
