Buying a new gun is always a good choice.

If you are looking to buy something that is alotdifferent than your 308 and 30-06 does not really fit that bill.
If you are looking for more power look closer at the 300WM. If you want something with less power the 30-30 or 243 is probably a better choice.
But in my opinion, the 308 is close to the 270,280,7-08,30-06