I see no reason to not go on that $10-12,000 budget if you really want to. Be reasonable and realistic and "just do it!" Esspecially if you are a hunter and have most of what you need.
But if you get bogged down in details and "wants" you can easily blow that amount long before you board the plane. We bought new guns, scopes, binos, cases, luggage, clothes, 2 sets of boots each, etc. Add in the extra prescription eye glasses and sunglasses for "just in case", practice ammo and range fees, and odd things like flash light and gun tool... All of which our PH had anyway.... I hate to think about it but to be honest, I think we spent $10-12,000 just on that stuff for the wife and I... And we did not go real high end. However a couple drab green or dark brown shirts, comfortable sneekers or hiking shoes, and a couple pairs of old blue jeans along with an old jacket and hat is about all you need. Good quality binos are nice but if it comes down to shooting an extra animal or new binos, use what you have and take the animal. The PH will be telling you the details you need to know and you want to be looking through your scope anyway... You do want a good scope but nowdays any mid priced brand should do fine.
Go early like April or May when the weather is nice and you don't need much for fancy gear... And if 7 hours per day pushes your body too hard, early in the season when it gets hot mid day everyone and the animals want to take a nap after lunch anyway. Plan to get out early morning, we often had one or two animals on the ground pretty early. Then take them to the skinning shed and relax over lunch and rest up, go back out for the couple hours prime time before sundown and you will be successful.
There are lots of Plains Game priced pretty reasonably. Go for one or two primary animals you really want and fill out a nice bag of the lower cost things. Maybe even ask your PH to call in a Jackal for you, you can sit and jackals are cheap or free.... Shoot a couple, the Ranchers in the area will be gratefull. And for more challenge, go after Baboons. Most will let you shoot some for free if not keeping them. I had no intention of shooting any primate, but I was there for a day and half and decided the Baboons need to die! Esspecially the one waking me up at 4 every morning! Never got one but I did try.