I say go with one gun and one really nice set up .... with rings/bases you are at your Budget.
Christensen Arms Mesa - 300 win mag w/ Swarovski Z3 4-12x 50mm
https://store.prophetriver.com/chris...akote-24-1-10/
https://store.prophetriver.com/swaro...-4a-ret-59023/
After that, when you save up another $300, you can add one smaller cartridge in the 6mm family and go from there.
The 300 will do everything you need it to do - and do it well.