Shane,
With good shot placement a 150 Grain Nostler ballistic tip would be fine for almost all plains game animals, but a 200 grain Swift A would be better. Better because it would be slower and thus you can be more sure of good penetration.
Your question about the cost of plains game animals is as difficult to answer as the one about the length of a piece of string. Some time ago I have searched the Internet for all hunting outfitters who published trophy animal prices. These prices were all entered into a spreadsheet and I have published the average cost for some of the commonly hunted species on my website at
http://www.mclarensafaris.com/new_page_22.htm Please remember these are NOT my prices, but the average prices as published on a total of 99 web sites on the Internet - so these should be a good guideline of what you can expect. I can beat these average prices in every instance, but not always the lowest individual prices. Just for interest sake the higest quoted price divided by the lowest quoted price vary between a typical value of 3 for the commonly hunted species to 8 and more for the more rare species.
Fyrthermore it is very improtant to know that hunting outfitting in South Africa is a very competitive business, and therefore you generally get what you pay for. This means that you are very likely to actually get a very good klipspringer when hunting with the outfitter who quoted $ 1250 while the guy who qouted $ 150 for the same species is not likely to be able to even show you one at a distance! :
All this shows that you should be very careful of using price to evaluate a hunting outfitter.
Even though my web site http"//www.mclarensafari.com is still under construction please feel free to go to the planning section to assist you in planning a South African safari.
In good hunting,
Andrew McLaren