I have thought a bit about something in this range. There are so many alternatives that can be considered. I'll list a few that have my attention.
1) Uganda for 9-12 days including buffalo and probably Sitatunga. Very different and something that most have not done.
2) Ethopia for Mtn Nyala and Lessor Kudu. Not sure you wouldn't need a little more $$ for that....
3) Some sort of a combo in Zambia to include buffalo and Sitatunga. Perhaps a Lechwe could be added in. Or a leopard under the right pricing.
4) Bongo. Need I say more?
5) The is a LDE hunt advertised on the other network that fits this budget.
6) Tuskless/buffalo combo would be a lot of fun.
N. America provides some quality hunts that could be a lot of fun.
7) Dall sheep/Mtn Goat combo. Could be exciting.
8) Alaska Yukon Moose with a Mtn Caribou. Big horns and remote.....
9) If your thinking of a slam then this will get you a Stone sheep.
10) Alaskan grizzly with either moose or Caribou.
There you have some of my top picks. If you decide on Africa and want a variety of experiences then go spend a week in Namibia, Zambia and Zimbabwe for an assortment of plains game and maybe a buffalo thrown in for good measure. That would give you time to enjoy Africa and just soak up the experience.
Bruce