My thought is this: if your 270 is accurate and you like it, scope it. Get a range finder with moa drop such as the Leica. Leupold, Nikon, and Bushnell are good too for your distances. You need something to get you a quick solution that is accurate.
This gets you started. A wind meter
is necessary in my opinion but I hunt a wide variety of terrain.
If you don't like your 270 or it is not that accurate get rid of it and go with a 6 or 6.5. You don't need a high end custom rifle
. Most off the shelf 6.5 or 243 rifles are accurate from my perspective.