Gibson made model B25-12 which is a smaller body guitar still with good sound. I have seen these used available $550-750 range.
The larger, full sized version was the B45-12. Figure $800-1000. Built like a tank, very durable.
With either of these investments, you are buying one of the finest American or anywhere brand name around. These instruments, will serve well for decades and because of their Gibson legacy, will hold their value, if not slightly increase (12 string guitars do not increase in value as much as 6 string guitars due to their more limited market desirability).